Button input from guest sent after program is stopped?

I came across something interesting while I was testing out a multiplayer game I'm working on. When the guest player stops the program, they can still send button inputs to SPOFS on the host system. It doesn't work the other way around though.

Yeah, I noticed that too when I was making Simple Paint. I stopped the program on my first 3DS and started typing on the keyboard. The second 3DS detected the touches and acted like the first 3DS was still connected. Heck, I could even still save and load backups.

This could be used to spy on someone else's 3DS... if you're in range, of course, and they stay within the boundaries of the bug.