Board Thread:Fun and Games/@comment-27996636-20180225211948/@comment-32233739-20180226142013

well in that preview, it does look like goku (in UI-Sign mode) gets hit by an energy attack and sent flying

possibly, he could be thinking

"I got UI when i took an energy attack beyond my limits when i was nearly dead, lets do the same thing again but when in UI-sign mode and I'll get an even bigger power up"

and thats how he goes grey/silver/white

but personally, I think the fight is going to be quite even with Jiren slowly taking the lead as he gets used to fighting UI goku and once Jiren is on top, he will go in for the W and it is at that point that Goku unlocks the full form.... just like the last episode Jiren went for the W and UI activated, i think same again but for the next transformation