Just a guess.... Possibly had previously inserted new mag into gun in left hand (still in slide lock) and, we saw new mag being inserted into the gun in the right hand. Then he released both slides forward at the same time for dramatic effect.
Best manipulation of a 1911 IMO that Hollywood has managed to produce. One handed press check, one handed reloads, only shoots 6-8 times between reloads although he must have had a ton of mags in his pockets.
That really is more realistic. That is the exact move I use to parallel park when I am in a hurry. I will admit I added a little padding to the left rear bumper, because I have mis-judged the spin by an inch or two. (I am thinking there was a little oil on the road)
I can't figure how why old Bruce was shooting up the passenger side of the car, as well as the dirver's side. Maybe he was going for a ricochet off of the passenger head rest.....
"It is better to be too skeptical then too credulous"