The difference is, Shane was afraid of going down. It's not because he could no longer pull the trigger.

There were moments when Shane would engage Pac and he had no problem pulling the trigger.

The difference my man, is that he was frightened with the thought of going down just as what he had experienced in the 3rd round. Observe his right hand after the 3rd round. He was using it to cover his face all throughout the fight.

Watch the fight again and you would understand what I mean.