Let's say I'm sitting next to Superman on the bus. And, say that for some reason-- maybe because his coffee is cold-- he uses his heat vision.
Could I see it? I mean, have we established that I could see little red darts shoot into his cup? Or, like on Smallville, would his eyes turn red just before he reheated? Or...would I see nothing?
Is heat vision, when applied by our superhero, visible or invisible? I mean, say Clark Kent wanted to use it on the bus next to me, without me knowing. Could he do that? Or would I point and say, "Hey, you just shot red beams out of your eyes...say! You're Superman!"
Just really, sincerely curious. Any ideas? Are you out there, Paul?
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