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This came up in a game, and I wasn't sure how to play it.

If you have a bike on top of a building, and it wants to jump to another building, the bike can perform a jump as described in example 3 of the jumping rules. But what happens if the roof has a small wall around the edges for cover (such as with the OI card buildings)? Is the wall ignored for being shorter than the template (vaultable), or does it turn the jump into an illegal parabolic jump?

As long as the wall is lower than the Silhouette height of the trooper you're fine.