Hit and Run chase gone wrong for the perpetrators

(Notice the first guy to approach never took his left hand out of his pocket… and the chair leg that the driver shoved through my window.)
I was driving to work from watford to Wembley, as I had just turned left at the roundabout onto the A4088 and was in the right outer lane of the two as eventually I’d be Bering right to get to the A406. A Mercedes sprinter open back truck/van under took me, but as he nearly passed me he veered right into my lane and clipped/ impacted the front left quarter panel just before the start of the door. The driver then re positioned himself in his lane and sped off. I sped up to try and see if he was going to stop. As we got down to McDonald’s on the A4088 there was red traffic lights and he had to stop. I went to get out of my vehicle but he jumped infront of some vehicles and sped off. I managed to eventually stop the van. The two occupants then got out with weapons. And approached my passenger window. The two then sped off on the a406 5:45 23.11.21