(so i'm gonna assume healthpacks instantly heal and people re-spawn when they die.)
Gabag had seen the sniper, and had predicted the shot, but was too injured to do anything about it.
He did something about it. He ran inside the base's garage and avoided the bullet andgrabbed a medkit, which soon after pickup had healed him to full hp. Afterwards he grabbed a shotgun, and jumped on a motorcycle and began speeding towards the Blue base with murderous intent.
He decided to be funny and Blare "Jizz in my pants" as loud as he could over the loudspeakers of the motorcycle, the valley's acoustics would easily let it play everywhere. But in case of more sniper fire, he began weaving in and out of sight with rocks, trees, debris, or the remains of his drop pod.