Troy decides to take a wounded Hitchcock to a German hospital. Moffitt states "There's a price on our heads". As he says the line you can see someone walking quite a distance away in the background over Moffitt's right shoulder.
Troy lights and throws a small bottle of ether which hits the German vehicle and creates a huge explosion setting the entire back end on fire. While ether vapors mixed with air can explode throwing a bottle of ether with a wick in it will not. Even if it did, that small amount would not cause the explosion seen, at most it would be a very small explosion.