SpencerWan said:
Christian Maize did such an excellent job with this explosion.

Initially I'd boarded it with the intention of animating it myself but then I ended up having to reanimate a bunch of other scenes in this sequence and I had no idea how it was going to get done. Unbeknownst to me the co-director had contacted him while I was working. When I finished the other stuff and went to check on the episode progress this scene was already sitting in there like a beautiful, unexplained christmas present.

I couldn't have been happier.