Duct tape mate, it'll buff out.
Go assy twinny and carry on

However, I got "attacked" by my Flow rear fin in the winter. Shore break bail out and the backwash caught the Board which then decided to want to attack me fin first...

My arse too the brunt, after ripping a large hole in my winter wetty... glad I was wearing it TBH because I had two stiches in my butt, and about 25 in the wetty.
Fins... nasty buggers when they're in a temper