You are Alexander....the old priest Cyril's assistant...and you were there when you saw him get corrupted by two demons. One being Mea and the other being a nun she corrupted. You saw Cyril's body becoming more feminine and with a last burst of 'white stuff' you saw their skin turn blue and white hair turned pink-ish purple as their beard hair fell down. Cyril became a demon. A succubus.

And you were next. So you run absolutely horrified.