Originally posted by One-Punch
The soul gem (i.e., Nemesis) wanted Rune to succeed and escape in order to be reunited. Why would Nemesis sabotage herself by weakening Rune's durability just as Surfer started battling him?
Because it never empowered him in the first place.
He was simply a medium. Even after he was separated from IG, the gems were transported to ultraverse.
BTW, there's no narration or statement saying Rune was cut off from the IG's power. It sounds like you're just trying to scrounge up any excuse to dismiss Surfer's feat. But that's not like you is it?
There is nothing to support that he had the power in the first place. He was just a means for the transportation as explicitly stated and was struggling to contain the gems claiming desperately that he was their master.
That doesn't seems like the one who has the power.