He didn't try it, if you must know. The disguising ability, he didn't want to risk it, not on this ship. He didn't know how to make it work on purpose or even if Thorax was right about it at all. He remembered his own time in that forest, how it had messed with even his own mind. It was the same mind that, if his suspicions were correct, seemed resistant to any attempts to alter it magically. Thorax might have merely been suffering under the same delusions, for delusions they were and certainly not real.