Shamir's secret sharing. In that scenario, capturing me alone isn't going to get you anything even if I divulge my piece of the secret. You'd still need to find out who has the other pieces, find them, and convince them to divulge as well.

Maybe there's 3 of us, and the 4th part of the password/secret/private key is on a server of mine somewhere. If I don't check in for x duration, it wipes itself.

Yeah it means my Monero is gone now, but at least my attacker didn't get it.