Please don't allow the man that you got these birds from to ever get near them ever again. He has no business with a birds. There are many factors that can cause the reactions that you have described and fear and anger are both big ones.
With the way that you described the birds treatment at the hands of this man, I am doubtful if anything that he has told you were true starting with the ages of the birds. Sorry, I have a major problem with people who abuse animals.
I don't have a male Senegal, but I do have a female of about 7 years of age and she also came to me from and abusive person. It made earning her trust extra hard but in the end she came around and is one of my sweetest birds.
Regardless of this, the bird is terrified of you and its new surroundings precisely because they are new and unknown to him, that is one of the most dangerous places for a bird to be, in an unknown place and without the support and protection of its flock. The treatment that he received from this man have only served to make this stressful time even worse for both you and this bird. So yes he is scared and angry. He does miss this abusive man, but only because he is familiar and the bird had to depend on him.
I will do everything that I can to help you with these birds. First of all are their cages placed where they can see and talk to each other? If they are not please place them near each other as this may help to calm the male. He may be older than this man said and so they may be bonded to each other or if he was honest about their ages they may still have a sibling type of bond and at this time they will help to support each other through this time of transition. They will talk and both of them will learn from the other.
The body language of the male is an aggressive posture because he doesn't trust you. Please read this link about their body language as it will help you to understand what your birds are trying to tell you
http://www.birdsnways.com/wisdom/ww15eii.htm Body language is their primary means of communication and learning to read it can tell you when it is safest to try to handle your birds.
The thing that you need to do is to win their trust and this is best done through spending a lot of time hanging out with them and talking and singing to them. In addition to this I would set aside two or three 15 minutes times to spend working on gaining their trust. Start by entering the room and stopping. Take a minute to observe their body language, look at them sort of like from the corner of your eyes so that they don't associate you with being a predator. Wait for the birds to relax and then begin to approach the cage in a round about fashion softly talking to and praising them. Anytime that they start getting nervous stop and take one step back. Continue talking to them and wait for them to relax before you come any closer to them. Repeat this entire process until you are next to their cages. At this time you can start offering them a treat through the bars of their cages. You want them to come to the side of the cage that you are on of their own free will and you want them to calmly take the treat from you without aggression. Then when your 15 minutes are up say good bye and leave the room. That ends the session. This is very important as it begins to let them know that you are listening to them and respect them. This is the beginning stages of earning their trust. Parrots are naturally suspicious creatures as they are prey animals and they don't just give their trust to anyone you have to show them that you can be trusted. I understand that the male will take treats from you but this is largely due to the fact that he must depend on you and he knows this, although he is resentful of this due to the abuse he has received. This is the reason for this level of aggression from him. Be patient and consistent and he will begin to come around. You just need to be persistent in trying to show him that you can be trusted.
I can't promise you that you will not get bitten by either one of these birds as it is a simple fact of parrots, they do bite. Most of the time it is not a big deal as once they know and trust you it is usually a fairly gentle nip to remind you that you are not listening to them. Sometimes they may be catching their balance. The hardest thing about this is learning that the best way to teach a parrot to not bite is to avoid the bite in the first place and that is where knowing their body language can help you the most.
It would be very helpful to know what their current schedule is as well as what their diet consists of and what is their feeding schedule. Pictures of them could also shed some light on what may be going on with them and suggest beneficial changes.
Flying is very important to their health mentally, physically as well as emotionally and some crashes are normal. It is recommended that they have a certain amount of time out of their cages on a daily basis, but you might want to wait a few days on this so as to give them time to relax a bit more and to hopefully begin to see that you can be trusted.