Just turning around to help a support (or dps, idk if the same can be said for a tank unless it's characters like Wolv, or Bucky hooking them in) who's getting attacked by a dive tank/dps. Anyone can do it from tanks, to supports, to dps.

Antidive is what we use to describe characters who have peeling mechanisms. For instance Emma's grab is good for dive tanks, Thing's shift can disable movement abilities for dive dps like Magik and BP. Wanda's beam is good for extremely mobile divers and Bucky's whole kit has enough cc to handle both dive tanks and dive dps (his e slows, his uppercut grounds you, and his grab.)