harmonious archon effect stays after it's been destroyed

Heartstone

I had an archon and a few tokens (his 1/1humans) on the battlefield. Greg killed the archon, but the tokens and Greg's creatures stayed 3/3. Creatures that entered the battlefield afterwards were ok.

Mburn7

They are investigating, per @Brigby on my thread here:
https://forums.d3go.com/discussion/80545/harmonious-archons-effect-persists-after-death-investigating