[UNH IM Ref]

A UNH IM bball ref asked me the other day if player A1 has possession of the ball inbounds and player B1, with one foot out of bounds, attempts to take possession away from A1 and a held ball situation arises is there any difference to the call because of the out of bounds position the defensive player has... i.e. the defensive player doesn't have legal guarding position so he may not make contact with the ball or the player? What do you guys think, I've been racking my brains..