Teamwork: surround flanking to subvert enemies

There are rare tactical games where flanking is not the only option to change enemy encounter through surrounding a unit\units with your troops from several sides. Flanking by two units is only one type. You can use some Reversi mechanics, whereas if you flank a unit (or several) from multiple sides, there is an option to SUBVERT an enemy, making it submit to your commands (acting as YOUR unit for a while or permanently). It's like a spell of sorts.

Also there are some cool teamwork features in Chroma Squad, where you can execute extra powerful attacks if an enemy unit is flanked from multiple sides.