Plutonium

Alright sorry then, thanks for the help anyways.

Yesterday I was playing BO1 Zombies by myself through the Plutonium client. I needed to go eat dinner, so I paused the game and went to eat. When I came back roughly an hour later, UNDERTALE was open on my computer, while BO1 was minimized. At first I thought maybe one of my sisters just started playing it, so I asked them but none of them have touched it. When I went back I was going to tell a friend what was going on when all of a sudden some dialog was started on UNDERTALE. I thought maybe I accidently hit Z but I wasn't even focused on the application. Then my mouse started moving on it's own and I started getting really freaked out. It tried to type something to my friend but out of fear I turned my computer off.

After a few minutes I turned it back on and before I logged in I put my computer in airplane mode, logged in, and uninstalled Plutonium and BO1 out of fear of them getting access again (little extreme thinking back to it, but I don't want to take any chances).

They haven't done any damage to my computer, nor snooped around, they just played UNDERTALE, so I assume it was probably some kid just messing around with exploits and such. But there could have been some serious damage to my PC if it was someone malicious.

Does anyone know why this would have happened? I was playing through Plutonium, and I was only playing Zombies by myself. Any help would be appreciated.

Thank you.