Practice Tool: Bug found out while messing with dummies @Riot

I was messing around on sandbox mode to check if my ping was ready and fine to play a match of ARAM. I had ignite because i didn't know what else to get and I was playing around and practicing riven on the enemy dummy. I used ignite in one of my combos because why not and I actually killed the dummy. I ignited the dummy and while it was at its lowest health, 100, and its health went under 100. I did an ability on it and it got killed. Even said It got slain. I do not know if anyone knew about the bug so I put it here just in case.