@@Pripyat Pony,
(I feel like you're over reaching with your magic a bit, not my call, but still)
He flew over, not exactly in a stable Hover, but managing not to crash or fall. He attached the explosive to one of the beams and pressed the button on it, It was made to be a 10 second delay. After 10 seconds the C4 blew, shaking the area a little and kicking up clouds of dust and dirt as well as throwing splintered wood everywhere. When the air cleared, the bridge was still in one piece but the center support as well as a good portion of secondary supports were gone. At this point the bridge would probably collapse under a car, and it was certainly no longer fit to bear the weight of any locomotive.