Well, at least you're trying to start a slide with REAL science, not like this faggot…:
Oh, wait… I just read what you wrote more closely. Nope, you too.
You are right the the Q would be mirrored if it were a real-life Q Signal light. But making viewers' minds pause to process why the letter doesn't look right only disrupts the meme's effect.
'c' is constant. And light travels at 'c' when unimpeded, such as in a vacuum. But we've always known that light slows down when traveling through dense matter. It's why lenses work. This is an extreme example of the effect.
Yes. This is not physics-breaking.
Read that again more closely.