Just put a static soldier, or few, with a prompt to nade the target (and instructions/keys).
When the nade hits, explain stun timing/proximity, potential killer, and tell the player to go claim their kill after the nade.
Doesn't have to be super complex..
"Set up cover, and spread out: Move guy 1 here, 2 there.."
"See the enemy in cover. Shots fired are ineffective, but there are answers! You can stress/flank/nade."
"Now move a soldier to nade the enemy in cover."
"Nice nade, go claim your kill! He's behind cover, so you'll have to get close to finish off. Beware of him waking up!"
End it with a juicy stack nade for like 6 kills.. feels good
"Be sure to cap the VPs after killing the bots who clumped up like silly heads!"