Skarner One-shots towers???

So...I came across this pretty crazy bug with a really big bug (get it? {{champion:72}} ). I hit a full health tower with a sheen-proc {{item:3057}} auto-attack and I one-shot (one-shotted??) the tower. The hit popped up as some crazy 5 digit number in **true damage**. Somehow, I don't think this is suppose to happen. I wasn't using any elixirs and I didn't have any dragon buffs. The only items I had were a trinity force{{item:3078}} and a cinderhulk blue smite{{item:3709}} Unfortunately I haven't been able to replicate it.
Report as:
Offensive Spam Harassment Incorrect Board