Escape SA 4:03
Messed up a couple times, but if I didn't, I could've gotten under 4. Maybe some other time.
*'Holy Rayola' timesaver alert* It takes Jonathan about 35 seconds until he finishes saying, 'cover me Jo' until he begins 'okay, stand back' assuming there's no randomness in his time. Once he says okay, the wall is fair game. So, anticipate his line, and shoot. (Jonathan can take about 3-4 grenades before he dies.) Also, if your life permits, you can shoot the side of the wall, so you blow up the hole while running through, like in Rescue.
Edit: Actually, I tried it again and life doesn't have to permit on the second one unless you were standing really close to the explosion.