My rule of thumb once you're already in a bad state is to figure out the fastest way to get to a good enough stable state. Deploys/roll-forwards are very common

My rule of thumb once you're already in a bad state is to figure out the fastest way to get to a good enough stable state. Deploys/roll-forwards are very commonly worn paths, so it's usually pretty easy to speed up a deploy or just do nothing and let it run its course. Rollbacks tend to be special, unique, and rare which makes it difficult, slow, and high risk. Odds are you'll be able to finish the deploy and stop the damage way faster than you can rollback _and_ undo the damage. Obviously, avoiding deploying broken stuff is the best case, but preaching about fire prevention in the middle of a firefight is quite a bit too late and not terribly helpful.