you need to be sprinting (held or toggled) for this to work. the timing can be a little weird at first but you can get a hang of it with a minute of practice. it can also be a little inconsistent
2025-06-16 update: a few people have told me that they've been doing this for months, so this isn't new tech (but this is the first showcase video that i know of)
0:00 - just boating down normally
0:11 - getting in and out of the boat
0:29 - getting out, punching, then getting back in to the boat