I'm talking about like when your ally Plagues Carriers and you EMP Shockwave them so they have 1 health and 1 shields.
Or maybe you like goings Ultras + Medics.
Or Disruption Web on Lurkers so your ally's bio can kill them easily.
Ensnare on the enemy's Muta clump so your ally can chase them down with Bio.
What are your favorites?