Forum:Discussion 'bout a non-legit move

Esentially, my opponent used Imperial Iron Walls so his monster's couldn't be removed from play. Then he used Quillbolt Hedgehog's effect to bring him back (Which takes him removed from play) (He had the synchron needed). He then proceeded to use Catapult Turtle's effect to use Quillbolt and make me lose damage. Since Quillbolt couldn't leave the field because of Imperial Iron Walls, he used the effect infinitely and then said that it was a legit move. Could someone give me a ruling on this? I'm fairly sure it shouldn't work.