Board Thread:Questions and Answers/@comment-10556445-20160201193617/@comment-2063612-20160201205059

In Kotomine's case, it was just a side-effect of Gil not being able to be blackened, so it's not not exactly the same as falling into the mud. Kiritsugu's case was a curse that Iri Avenger put on him rather than the effects of blackening. Normally, people will just melt like Shirou in a number of the bad endings. If they don't, then they should end up twisted like Sakura.