Escher has the dots himself on his hands.
So he either is a dothand still, was a dothand or at some point was impersonating dothands. I think he may have told her about the dothands to drive her into their (his) trap. She didn't know who did what when before this, now she has a dotcrumb trail to follow and he knows where she is going. He can determine where she will be by the judicious dropping of dots. He can direct her. He can totally set her up.