Onslaught on kill, timeless jewel, random not on kill.

So I have brutal restraint, 662, which adds "You got Onslaught for 8 sec on kill" added to Cloth and chain notable. Now, I am using totems to get "on kill", but while i get the onslaught buff, it isn't "on kill". It's like "randomly on kill".

Is this a description failure, or is this not working as intended?

totems/traps are their own entity, if they get the kill you do not get on kill effects.

if a dot they apply gets the kill it it counts as from you so you will get it from them.