Patriot-3: That can't be right, can it?

Yahoo/Reuters ran a picture of a Patriot Advanced Capability-3 (PAC-3) missile launch this morning.
In addition to the blast emerging from the tail of the missile, there’s a big sideways fiery plume coming from well up towards the front of the missile.
Is that normal for these things? If so, what’s it for?

This photo shows it too. Maybe it’s a vernier rocket (small rocket engine used for control)?

It’s the firing of a missile ACM (attitude control motor). The PAC-3 missile has a set of small solid-fuel rocket motors on its midsection that are used to improve the maneuverability of the missile. The Dragon anti-tank missile had something similar, a bunch of small solid-fuel rocket motors that were embedded in the skin of the missile, which made it look like a rabbit as it “hopped” downrange.

I can see how it’d look that way. Judging from the size of the flame, the Patriot must jink right smartly too.