http://flic.kr/p/aovUdL - Link to the picture
It looks to me like mike is aiming for jesse's head and gets shot before he can do anything. Jesse is most certainly a strategic pawn. That’s exactly why Gus didn’t let him drink the poison at the party. Gus knew that he and Mike could use an extra loyal gun in their attempt to fight their way out of Eladio’s home. Once they made it to the car, they thought that there was no further reason to keep Jesse around. That’s why Mike tried to shoot Jesse in the back. And then, ironically, Jesse saved their lives.
If not aiming at Jesse, who or what was Mike aiming at? The shooter was on Mike’s left, and no trained shooter swings an extended arm 90 + degrees over an open car door to make a shot. How else did the sharp-eyed Mike, who never seems to miss a detail, miss the shooter unless he was focused on ending Jessie.
I don’t see how people are thinking that Gus and Mike are somehow being genuine with Jesse. Gus always intended for Gale to replace Walter, and always treated Jesse with contempt.
That was the perfect time to get rid of Jesse, and the look on Mike’s face after he gets shot says it all, at least to me