I 100% agree with the advice to keep a semi auto shotgun in the barn or maybe even an AR. Lots of places to surreptitiously conceal and secure it while still having ready access.Why did you leave the safe heaven of the barn or no go straight into your house?
Notify sheriff’s office of the incident?
you did notify the biker they were trespassing?
As mentioned, you engaged the biker and got way too close [knife and/or physical over powering close] where you put yourself & family in harm’s way with too small of caliber for the biker’s leather and # of cartridges on board.
hypothetically, IF, standing outside in the middle of your yard O/A midnight, having this conversation, and showed the biker your only defense, and you got spooked, panicked, and inadvertently/purposely shot and injured the biker, there would be, i’m sure, a he said you said debate requiring judicial Intervention which means $$$ for shyster fees to defend yourself.
While this might seem like an isolated incident...one hopes you see the immediate need for a shotgun w/a box of shells in the barn as well as in your home in case said biker, possibly with friends, returns to get some gas.
Ps: assure everyone in the household know how to operate and fire at least once, said shotgun w/o hearing protection