Each testimony is separate and unique. A valid and detailed testimony should not be used to validate a lie. It diminishes the value of the true testimony.
Seraphina’s testimony is clear in all its details. It is level-headed and fair. It has time, setting, and people. It can be easily verified.
Catholicus can’t do any of that, and when asked, the writer refused.
Indeed, but read again how much of Catholicus' story has in fact been verified. You keep ignoring that. Ignore if you will the parts that have not been verified, the soup incident, etc. But EVEN IF YOU TAKE THAT OUT, the case against Pablo is damning. Then combined the corroborated parts of Catholicus' story with Seraphina's account, and a picture emerges.
You believe Seraphina, and didn't ask her details to verify her story. Why? You tipped your hand when you dismissed occult practices as "mumbo jumbo". Seraphina's you find credible, whereas Catholicus' do not ... both for no reasons other than your emotions. Why didn't you grill Seraphina about the color of the bath robe, details about exactly when the fake blessing incident took place, etc.?