Arrows with NoAI tag gain a blue particle effect

Using the entitydata tag "NoAI" on arrows makes them gain a blue particle effect

What I expected to happen was...:
I expected nothing to happen because arrow physics don't count as AI

What actually happened was...:
the arrows I fired, like I said, gained a blue particle effect

Steps to Reproduce:
1. Place down a command block
2. Turn it to repeating and always on
3. insert this command: /entitydata @e[type=!Player]

{NoAI:1}

4. fire arrows