If he remembers this part of the conversation come the next day, Russell's going to express concern that Walter's first choice was recommending other art supplies. What helpful enabling - of, admittedly, relatively harmless things.

For now he slowly follows after, in the right place and time to see the cake go flying.

"What, why... Walter!" Russell sputters, throwing his hands up in the air. "That's an even worse waste! Can you even taste it? You could have shared it. I happily would have taken a slice... Are you hearing me...?"

His flatmate's stillness finally registers, and Russell glances around for signs that other things are still moving.

"Did... Did I stop time?"