[1.9] Armor stands tip over when killed.

Partner Rank: 3
Verification Builds: New beta 1.9
Summary: When killing an armor stand, it turns red and tips over before disappearing.
Repro Steps:
1. Create a new world
2. Summon an armor stand.
3. Run the command /kill @e[type=armor_stand]
Observed Results: The armor stand turns red and tips over.
Expected Results: The armor stand disappears
Screenshots/Videos attached: No