I was just thinking about the explosive gel, and it occurred to me that there's no real way to trigger it, is there? Cause doesn't Batman just spray the gel onto the wall in the shape of a bat? Then he steps away and triggers the gel with a remote detonator in his hand. But how does that signal from the detonator activate the gel? Is there some sort of receiver stuck inside the gel that receives the signal from the detonator? I didn't see any. The gel itself can't possibly receive remote signals, can it? It's just this gel substance.
Has anyone figured out how Batman triggers the gel to explode?