During this stupid soldier-demoman war, the best way for the engineers is probably escaping.
I love the idea.
that the bands in the sky?
Pretty nice. Some motion blur on the shells and maybe the background would be good. Go easy on the bloom too.
On-topic: Nice blur and posing, and I like the idea too. You could have edited the muzzleflash in, though. Looks a bit weird that way.
“Spy sappin’ my ride!”