Does Sentinel happen BEFORE or AFTER resolving the triggering attack?

@Ariamythe @JeremyECrawfordDoes Sentinel happen BEFORE or AFTER resolving the triggering attack? @mikemearls and @JeremyECrawford, thanks in advance for clarifying. I'd say it's before – it's similar to an opportunity attack; that triggers before the creature leaves your reach — Mike Mearls (@mikemearls) October 5, 2014 @mikemearls @JeremyECrawford Would that extend to all reactions then? Are […]