That's fine with Reaper, in all honesty. The less attention his statements draw from the crowd, the better. He goes back to being a slightly glowing statue in the back of the room. He doesn't think Casey would know what actual death smells like anyway, considering he's not a killer, but he'll give him the benefit of the doubt.

He could say something, about how he doubts Casey would know the actual stench of death, but this is a movie night. It's one thing if he came here to crash the party and ruin it all, but that's not his objective. He's just here to draw enough attention that it wouldn't bother Sombra's "investigation".

So instead, he just snorts.