I can see this from both sides.
On one hand, it's certainly annoying to have a guy from a division above swoop in on recruits you thought would probably be yours.
On the other, it's not only legal, but as some have pointed out, could have been at least a decent (if not good) strategy for him given his situation. You may think it's not right, but it is what it is.
I wouldn't do it nor would I want it done to me, but that's a decision each has to make for themselves I guess.