My main issue with the event is the lack of space to maneuver and react. You are limited to this tiny ring around the pool in the center with enemies leaping in and climbing the walls right beside you. If the center pool was removed or at least the slowing/stamina effect was gone then I could have enough room to do my dodging and have a moment to react to what enemies are moving in.
I do like the idea of the event being a “They are all around us! Backs together!” kind of style. But with the tiny ring of space you get to work with its annoying and hard to pull off.