Trapper: Non-killers don't remove traps

[NettoTakashi]

Was just in a round of Lovers Mode, playing as the Trapper. On N2, I set my trap on Giles Corey's house. N3, I was informed that an Escort and a Pirate had set off my trap. I believe (though I could not confirm) that Giles won the duel with the Pirate, and thus was not "attacked", so the trap did not kill the Pirate. The very next night (N4), I was told that I was still building my trap, and Medusa died to the trap that was still on Giles Corey's house.
Possibly relevant: I was also plundered by Pirate N4 (though I won the duel).
Screenshot of N4 (did not grab one of N3): https://www.dropbox.com/s/rgfxds9nzozmz ... K.PNG?dl=0

Are traps supposed to stay up after a non-killer trips them? If so, this should really be made more clear.