Vengeance melee targeting strategy. Interesting.
How well it works depends on how many bots are also doing the same in the battlefield. If many competitors start using it, swarm targeting will no longer be the most effective strategy in melee.
I've actually tried that, by introducing a factor into the enemy's targetability which increased the better their survival was and the bullet damage they cause (to everybody, not just me, since I track that). This way I hoped to take out potential threats before they reached the endgame, but it ended up giving me less energy reward, so hurt my score overall.