Thresh Ward Hook (Q) Bug

The enemy jungler (Hecarim) was clearing an allied vision ward (mine). I threw my hook at him right before he landed the final hit on the ward. He destroyed it just as my hook passed over it to pull him. My hook then grabbed the new ward leftovers that are left behind from destroyed/expired wards instead of Hecarim and pulled it over the wall ignoring terrain.

I'm pretty certain this isn't supposed to happen.