7.3 In the example, the unit is not using the one hex range to blow the bridge. It is in the same hex as the bridge.
A ZOC Bond cannot extend ACROSS two river hexsides or two
Wooded Rough hexsides or any combination of those two. A ZOC
Bond can extend along a Wooded Rough hexside as long as that
hexside does not join two Wooded Rough hexes. A ZOC Bond may
extend across a Lake hexside.
In the example, the zoc bond is attempting to cross a wooded rough hexside and a river hexside, so it fails for the "combination of the two" exclusion.