Elevatethis - He took his Nile back because it bit his sister. Can't say we didn't warn him!
I also think you should stick with the Tokays, they are aggressive enough for you at the moment.
Infact, I wouldn't expect him to get a Bearded dragon. It seems far too common for him, I think he wants a species that none of us have, and he wants to flaunt it at us. If this is the case, its pathetic, look how it backfired with the Nile. I honestly can't see how his mom would let him get anymore animals, especially if the last thing he got was so aggressive and attacked another of her children.
Paul