As to Tiger Lily…we don’t know if they exist in the ONCEiverse. But Hook trying to drown Tiger Lily is keeping with Disney/Barrie canon which is where POM is coming from, I do believe.
Yes, I remember that from the book and movie…but in both of those instances Pan goes out of his way to save her from drowning rather than orchestrate it, and that really doesn’t seem like something OUAT’s Pan would do, haha.
No but Pan might have ordered Hook to do the deed for whatever reason.
Overall, though, it’s a rather moot point. I honestly don’t think show will ever flashback to any truly vile deeds Hook has done, unlike with Regina and Rumple. And this isn’t a criticism of Hook so much as the show, but the writers stopped being interested in selling Hook as the VILLAIN who was brought on to rival Rumple awhile ago. Any and all flashbacks we get of Hook will most likely not focus on anything dark, like massacring an village or killing mute maids.