Checkmite
Skepticifimisticalationist
Then Drejka appears in his vehicle, gets out and walks around the parked car. At 1.27 (in the video timing he approaches the passenger and the argument starts between Jacobs and Drejka. We do not know exactly who is more aggressive or what, but as others appear they all look over to Drejka and the car. At 2.07 the lady who walks out the shop looks over twice. Just after a male gets out his car and keeps on looking as he holds the shop door open for another female (around 2.28).
Indeed; it's obvious by the reactions of basically everyone who approaches the store after he initiates the confrontation that Drejka along with his openly aggressive posturing is being quite loud. I suspect that McGlockton probably heard the confrontation from inside the store and only emerged when he was informed that the target of the abuse was his girlfriend.
Coincidentally, I think Jacobs hypothetically would've had a stand-your-ground excuse to shoot Drejka if she was armed, once Drejka began pointing his weapon at her after shooting McGlockton.