[FlareKnight]

Originally Posted by Divini

Spoiler for minor spoiler for game mechanics:

It's explained in the source material for this story. Rooms that are owned by players, whether it's an inn, rental, or owned, are completely airtight when it comes to trespassing. And yes, this includes windows. Also there's no lockpicking skill.

Spoiler for LN plot material from this chapter, just in case:

Also Kirito and Asuna tested and refuted the 'attack from outside' theory (wasn't shown in anime). Kirito stabbed himself and confirmed that safe zones make you immune to even dot (damage over time) effects.

Spoiler:

Would that kind of test actually disprove the theory though? If someone with a strong enough attack did so from outside the limits wouldn't it be able to do enough damage to kill off a player? Not to mention he's either going to be stabbing himself inside of town or outside of town, even if he's straddling the safe zone the game might not recognize a self inflicted attack like that.