[@Gate Keeper]
Try not to instant-kill them. Attempt some kind of combat that would be realistic in the setting and you will take them down. 

[@Azazaa]You have time to react. You can come back with the innkeeper to face them or maybe find the room empty and then go upstairs to see what is up. And the alarm [@Gate Keeper] set should be heard downstairs as well since it's as quiet as it gets in the middle of the night.