[don't underestimate him. he'll be avenging that pawn in just a second now]
It wasn't widely noticed. Most people dismissed it -- a restroom in the education center that wasn't cleaned. It was rusting over, it smelled badly, the water was miscolored -- they probably went in and decided to go elsewhere.
Today, there's nothing out of place about it. It was only there last night. And it was connected to the attack.