Here’s I’m just training to cut the danger in half by seeking cover from one bad guy while engaging the other one. Then I use cover, and switch hands & shoulder, to engage the second bad guy.
To switch shoulders I have to manipulate my sling, pulling on the tail to change it from shortest length to longest length so that I can get it across my body to my left shoulder. Then I’m using left-handed grip and left eye to keep my danger/exposure to a minimum when I engage.
You’ll also see me crouch down on the last couple of reps as I engage the second bad guy from cover. This is because he saw me run to cover and expects me to come out at the same horizontal level. I gain a half second or so by engaging from a different horizontal level than he likely expects