As per usual, Daniel is speaking rationally and intelligently, and Peter jumps into poorly-thought-out action. Having actually had Peter's power for a while, Seth realises what he's about to do just a moment for he does it. He's also tested its limits, and these chains were impervious to his own power, which is why he figures teleporting out of here is a very bad idea.

"Peter, don--" is all has time to say before it suddenly feels like his arm's pulled out of its socket, following the other trend in these imprisonment dreams of hurting their arms and shoulders. He barely manages to not get tipped over, and the other arm gets pulled pretty hard too, yanking on the chain attached to the wall, but not as bad.

"For fuck's sake, Peter," he says with gritted teeth, trying to reach up to rub his shoulder, only the chain's a bit too short for that.