Jake looked at the energy radiation and his expression changed into serious mode. He was smiling till now since he had recieved a massive upgrade, but he didn't forget that he was in a place called the Demon Cult, a force that has dreaded his country and the world for so long.
How could not know that every cultivator in this place has the potential to fight with someone who is stronger than them. This wasn't a fight between commoners, it was a fight between geniuses. Darius was one of those geniuses.
He was completely serious and from now on he was going to do his best to put Jake down once and for all. This was the effect he wanted to achieve. If his attacks were truly powerful, Jake would take advantage of them to grow his BOU to the next level.