Question about Justine

[Hunter of Shadows]

In the water part, is it possible to hide from the monster? I watched a playthrough and the guy didn't try to hide from it at all, is it because you can't?

Also I've heard conflicting statements, some people have said that the monster is really slow, but others say it's really crazy fast(like grunt or brute fast)

Also...in the library, upon either saving or killing the priest, when you encounter the monster, me and my brother were wondering when you go to the water part just before, we watched someone get chased by the monster almost immediately, even though it evaded it earlier quite well, is this a scripted event? Similar to the brute in the sewers?

EDIT: Ah okay, for clarification, the 'water part' aka the Dungeon and the 'library monster part' aka the Potato room