Burrow was going to be tackled. The warrington player had the angle and the speed. Burrow isn't a 16 stone forward/back that can fend the defender off those last few metres.
If he continued his route he was about to be tackled, the support player out on the right wasn't really on because there was another warrington defender blocking that line. So burrow could either continue and be tackled, or cut back and have a chance of wrong footing the defender. He took the option that gave him the only chance in that situation of scoring.
Burrow has 15 years game time in the memory bank. His brain was able to quickly judge based on his speed and the angle of the defender he was about to be tackled. It was instinct. To avoid being tackled his angle would have had divert so that he was just running straight toward the touchline rather than the try line. I think people are so used to seeing those little legs drive away from defenders to the try line they just expected to see him whizz in at the corner.
But it wasn't on.
He bombed nothing.