the fact is if someone stay in the rays, red lightnings the beasts are recovering hp very fast. easy as that.
yes when ppl stay in the lightning rays beasts recover much more faster than normal (its draining hp from ppl to beasts) in very center (red dot in middle) even more (dunno why but some ppl tested in ncwest and rus global and said whole arena work like bullseye closer to center more hp it restores)