I think 'spotlight' works quite well but, as Andrew says, it would also be good to make the rapid-fire, interactive aspect clear. You might be interested in this reference where it's simply presented as the 'flash' method:

"Flash –- Blitzlicht
A group method to quickly assess the momentary state of mind of each participant in the midst of a teaching or discussion phase, most easily applied to a circular sitting order. The participants make a short statement in turn, starting with somebody volunteering to begin or designated by the tutor. The result is a “flash picture” of a given learning process." (UNESCO Glossary of Adult Learning in Europe)

My proposal is loosely based on that. If the "flash picture" aspect is what matters, though, then maybe you'll need something completely different (like freeze frame?)