"The seals are helping but they're also the problem. He has them around him."

He draws that.



"I have different ones around me."

He draws that, too.



"Where my body is, I'm trapped."

Liiiike so, Sokka.



"Even if I could get out, I can't leave where I am, or I won't be able to keep him trapped. Mine go with his."

Tada!



"The ones around me help me use the ones around him to keep him trapped where he is."

Scritch scritch goes the ice, and there's the trapping there for Sokka to see, in all it's detailed, highly scientific glory.



"The problem is that means the moment I got freed, he would be, too."

Which means they could just free him after they get rid of the guy, though, right?