my only gripe would be that it takes 3 panels of confusion before the payoff, which feels like a long stretch
I'm a fan of tension-building, so that actually works for me. It's reasonably witty / amusing dialogue too, IMO. If it wasn't, then yeah, 3 panels would probably feel long.
Also, I'm thinking that the authentic FBoFW typically ran 4 panels, so it's also a nod to that.