Sounds like a Tiger Shark.
Fairly common around Hawaii.
That's correct
When Are Sharks Likely to Attack in Hawaii
having said that, I know a guy who grew up in Hawaii, and he was attacked by a hammerhead shark. Gave him a gash on his lower leg, but otherwise got away fine.
He also went to same high school as Obama at about the same time. Said the "choom gang" stuff - all true. Obama was known as a good basketball player - and a total pothead.