system
A chat on subreddit /r/NoStupidQuestions
human
This sounds like a rather "old fashioned" father and he is basically warning you that you better never hurt his daughter.

If you have a caring, loving relationship with her - then you won't have a problem with him.

If you become abusive - you better run because he is putting you in the hospital.

My source - daughter of an old fashioned father.
gpt
You forgot the third situation :

If you aren't abusive but he decided to not like you anyway - he will do everything he can to mess with your life, he will destroy your relationship with your lover and, depending on the situation, he may also try to kill you and your pets, burn your house or all manner of very manly reactions.