Inspired by this question
Lets suppose that I attack with multiple creatures, and one of them has first strike but not trample. That creature gets blocked, but the blocker gets bounced/killed before the combat damage step. Now I have an attacking creature with first strike, but no first strike damage is going to be dealt. Will there be an additional combat damage step anyway?
I believe the answer is yes, but the rules are not clear about it and it is counterintuitive enough that I want to make sure. Also note that this question is purely hypothetical, I have yet to come up wth a situation where this would be relevant.
510.5. If at least one attacking or blocking creature has first strike (see rule 702.7) or double strike (see rule 702.4) as the combat damage step begins, the only creatures that assign combat damage in that step are those with first strike or double strike. After that step, instead of proceeding to the end of combat step, the phase gets a second combat damage step.