Invulnerability Glitch

I don't know how this happened, but it did. My brother hit my computer while we were playing a game together(AR URF), and then my champ stayed completely stuck in one spot on my screen. I didn't know I was moving when I was clicking, but my brother could see it on his screen. So from his screen I was able to see where I was going. I started to move. I WAS INVULNERABLE! We used this to our advantage afterwards. By turning his screen towards mine, I was able to cast spells and play at my will invulnerably... I just don't want my account to get banned.