I don't really see the problem. He is in front of you so you can just slot back in behind him. Perhaps you shouldn't have left it so late in attempt to merge? You're the one who is changing lanes so the cars in the other lane have priority.
I really dont get it... so the Taxi went through a Red light, the dash cam driver went through on amber (which had just changed and would have had to do a emergency stop to stop in time)
Despicable