Would you
a) continue to taxi hoping the fuel doesn't ignite, and to get closer to other(?) emergency services which are not shown on the video?
Or
b) stop as soon as, and to allow the fuel to pool around and under the a/c with hot brakes - potentially trapping all inside if it went up?
Very good question. Not my initial reaction, but now you mention it I think a) would be the best option. You wouldn't have to taxi fast; the trucks could catch up and start spraying when you stopped.
The hypothetical evacuation could have been good; cabin crew look out door windows, see nothing untoward and evacuate straight into pooled fuel.
