Board Thread:Fun and Games/@comment-27996636-20171206104646/@comment-26510251-20180106124134

CakeBuu wrote: I think the spirit bomb more fueled him for the fight rather than acutually gave him the UI power, he was all out of energy for fighting and needed an energy source to use to continue. It helped trigger it with the damage and helped him continue the fight with energy, but was not the reason Goku turned UI, as we saw with his battle against Kefla. It unlocked a transformation by testing his limits. If he died, he died. But he didn't. The bomb powered his ability to form that new transformation that allowed for UI to be used. He had zero energy left and was basically running on spirit bomb energy.

He's now running on what little power he can muster up and recover in the little time the tournament has left. Not enough for a full recovery obviously.