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Flashbangs usually do the trick (he'll surrender), or you can try incapacitating him with a couple of shots from your pistol (no big deal if you kill him, you'll still complete the objective).
One thing you can do - sometimes it works, sometimes it doesn't - is pack some mines with you before you start the mission. Assuming you know the spot were he jumps off the ledge onto the ground (west side of the castle), lay some mines down there, that way, if he does make a run for it and leaves your sight, he may land on a mine and, voila, objective complete. Like I said, though, sometimes it works, sometimes it doesn't.
Hope this helps.
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