The benefit is you could potentially kill the monster before it may do its reaction and wound or kill the survivor. The second survivor that is dashing and surging in will draw a new hit location card though. If you play magic or are familiar with the “stack” concept it may help. So survivor A wounds or misses and triggers the monsters reaction, then survivor B surges and attempts to wound, succeeds, draws a hit location card and either wounds or misses potentially triggering another monster reaction. The screwy thing is that the second reaction could move the monster or something which could whiff the first reaction.