Not even when you got the seal? Like, there were multiple poison clouds and like 6 of those creatures, it's hard to miss them transform then.
But meh, I guess you were just unlucky. xD
Also that when you get the outfit of... I don't really know anymore which outfit it was, but it was also a place with alot of those creatures and poison.
So I don't know how someone could've missed that. Maybe they were all like: ENEMY!, SHOOT SHOOT SHOOT.