Prompt. Because why not.
Although…I kinda think it is a fun challenge to anticipate what could happen and set a reaction up in round one to go off for in round two. You can get a sense of who is moving tactically to attack you, decide if they are enough of a threat to warrant a reaxtion, and set up an autocounterattack when they do attack you…with the chance you may lose it if no one takes the bait.
I did that with Will alot using Hellous Rebuke and it was satisfying when it worked out, frustrating when it did not. I enjoyed it tbh.