User blog comment:Willbachbakal/Multiplayer Plasmid Combos: Insect Swarm/@comment-209.62.172.175-20101218014047/@comment-1330314-20101220161044

Yay! Someone who looks at all of my ideas! And my combos, too; I didn't think anyone would post anything here, let alone look.

To answer you, I didn't want to give any Plasmids to the Thuggish Splicers since they're not meant for that. While the blood effect just paints a slash of red onto your screen, this completely blurs your vision, which isn't fun if one in nine melee enemies in the game can do it to you. Also, this is a multiplayer thing, while the Thuggish Splicer belongs in the singleplayer.