Idea: Power/Fight [Chase> Caleb]
In Chase and Caleb's Fight, Chase was not the loser. Not in a typical way. He did lose. He lost in the sense that he was shot with his own energy ball that had been slightly powered up by Caleb. Which could mean that Caleb added just a little extra juice to Chase's attack, but not that Caleb was powerful enough to make something like that on his own? Chase, the oldest of the Sons of Ipswich, was also the most powerful of them. He was born with a naturally heightened dosage of The Power and was insanely stronger than the other Sons. Making it that he was hoisted on his own petard by the end of the Fight. Something of that nature. Caleb is still as strong as all the other Sons would be, after ascension. Which is as strong as he should be after Ascension, which is like only double as strong as he was.
Chase already proved he could beat Caleb easily (Though Caleb was a little bitch who chose not to fight back because Sarah). Chase wasn't trying to kill Caleb, he just wanted to have the other will their power to him. Caleb is nothing more than 'average' like the rest of them when compared to Chase, even then. Also, if The Power Drains its user, it could be assumed that Chase has never shown his real Strength where The Powers are concerned. As he has this little thing where he unintentionally changes the weather almost all the time. Which could be assumed to zap quite a lot of The Power's energies from Chase overall. Paired with Chase's excessive use conjuring Spiders and making illusions and such like that. By the time the Chase and Caleb fight even took place Chase was probably at 2/5 of his own strength, maybe less. Of course, this could all be assumed to be wrong. But these are just my thoughts overall on how the Fight ended the way it did, for the most part.