"If you've no clue where it is, then all we can do is keep looking," Sieghard replied. "Before we set out, you mentioned you had rope. Let me see it."
He tied the end around his waist for safety, took a look into the water to make sure the creature was gone, then stepped back, started running, and jumped the gap. "Wasn't so hard," he said, untying himself and looking for something to secure his end to.
(1d100) Bad roll, but it still gets him across. When I said Sieghard can't fail earlier, I wasn't accounting for the movement penalty from armor. Failure + 2 DoF here still gives him a 5 yard jump though.