Just watched and listened again . I think he may have clipped the wire.
I hear it but hard to say what it is. Doesn't seem to disrupt the ship and he looks a little high at that point to've caught the wire. There are two quieter versions of the same sound, firstly just as the shadow touches the tree, and then as the shadow crosses the far bank of the road... some sort of wind/mic type anomaly? It's not a clear film or soundtrack though.