While she initially felt reluctant about it, Katerine understood that this was just a dungeon (even if it felt way too realistic) which was why she pressed the trigger button on the gun as a hail of bullets showered Krampus and Bu Dong. Bu Dong agreed to her decision as that was the most optimal choice that Katerine could have taken. If she had hesitated any longer all his painstakingly effort of pinning Krampus down would have been wasted.
Trying to rescue Bu Dong would have jeopardized the whole dungeon run.
Thus, the Angry Ape cultivator basked in the glory of the holy rain as he received a close up view of Krampus being torn to shreds before being teleported into the Luxury Recovery Instance.
HAPPY DIWALI to my hindu readers :))