His character bio says that since being 'infected' by the tadpole he's no longer affected by daylight which makes it strange that he's affected by running water.
The tadpole is having all kinds of odd effects, but maybe it doesn't universally apply to removing all of the vampire weaknesses that we're aware of.
I'm hoping to stumble into some other things like this to give me some more insight on how exactly the tadpole changes a person's physiology.
