Q starts when Severus speaks, narrowly missing cutting himself. He has a tendency to get wrapped up in what he's doing, oblivious to his surroundings. This has caused him no end of trouble*. "Um, yes," he says, recovering and setting down the knife. He waves a hand and the shreds disperse to the grids. "My sizing is better. The pieces are more uniform. But," he makes a face, "my speed isn't nearly where I'd like it to be. I think it'll get better with more practice." He looks anxiously at Severus, waiting for his opinion.
* Quite possibly the understatement of the century! :D