I would probably put a little torch on the knurling, until it is smoking hot, then get a little pipe wrench on it fairly quickly (before it transfers all its heat to the gas tube, and loses the differential). Give the end of the wrench a real quick rap (or several) until it breaks.
A couple members mentioned this; I'm not adding anything new, but I would be very surprised if the combination of heat and a good whack doesn't get it.
You could try giving it a twist the other way, just to work it also, if all else fails.
The bolt head looks like it is in too good a shape to get a smaller wrench on, but you could try for the next smaller metric. I would say that either the head or the wrench was slightly the wrong size.
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