Jake expression darken when Evan approached him with his fist glowing brighter than before. He knew he wouldn't be able to stop Evan and Ezra anymore. Not that Evan and Ezra were on a different level now, but He was slowly losing his balance.
The titan Whale energy wasn't a healing one. He had already received a critical attack just now that had affected his brain so no matter what he was on the weak side. The titan Whale only boost his power and his body was slowly starting to lose control of that power.
If he was perfectly fit, he would've been hitting harder. Evan and his team wouldn't have been able to throw a single punch on him regardless of their comrades dying.