As it's mentioned during the spell’s description, Hypnotic Sample does set a charm around the affected creatures. You do not need gain on attacks against incapacitated targets. Plus they continue to make saving throws as typical. These are definitely clarifications on how the incapacitated condition (PHB 290) performs much more https://andybhnrv.blogspothub.com/33716199/the-ultimate-guide-to-patron-hipnotico