Axel was the first to breakthrough in terms of physical attribute points. After all, he was the first to experience what it felt to be closer to death.
At this point, the flank was the first to welcome the most absurd amount of Second Mortal Stage zombies they were about to face. Jasper has the most battle efficiency compared to Axel.
After all, Jasper possessed proficient decision skills, coupled with his adept spatial awareness. Understanding that going all out would put himself in danger earlier, he decided to simply slow the pace of the Second Mortal Stage zombies and conclude what to do henceforth.
He preferred the "what's best in the current situation, considering the future" tactic. After all, Axel simply went all out, without fully assimilating the information about all the Second Mortal Stage zombies near him.