Damn - that's even worse when it's your own crew's line
I got lucky once when my buddy got line in my prop. Turned that engine off - fished on other one rest of the day and came in on one.
Once home - pulled prop and found short piece of his line we had to cut - but also few feet of line from ??????. Best guess from from Sandy Point jetty area.
Luckily - it did no damage but likely would have if left there for any time.