Checked the walkthrough, and it doesn’t seem to mention this at all:
I’m trying to get the bag of ichor out through the water, which the walkthrough confirms is the intended course of action, but it keeps getting stuck on a “rusty burr” in the pipe, which isn’t mentioned anywhere. I’ve tried greasing the bag, manipulating the burr itself, putting blood directly into the water to dissolve the burr, and putting other things into the water to knock it off, none of which seem to have been anticipated.
What have I missed? What am I doing wrong?