the Yanks seem to be particulalry brutal in the swim - no prisoners at all. IMFlorida was a 3.8K fight (2200 started).
but then Smiley Lady got punched in the face deliberately during the swim exit for lap 2 at IMCH. the punch broke her nose but they never did find out who did it - no video evidence and you try telling the differenece between one person in a wetsuit wearing a swim cap and goggles and another. she finished btw - tough old bird is SL...
I've only deliberately hit one other in the swim - at London Tri. one guy kept constantly swimming into me and after the 5th time I smacked him on the head - never saw him again.
but it's always best just to focus on your own swim and accept that 99% of the time it's not personal and it happens