I use crouch to aim at the croner of the wood plank. Or just aim at the middle of the bright/dark part of the upper wood. Practice is advised.
For more nades check out my profil or my youtube playlist: https://www.youtube.com/playlist?list=PL-5bYBYbnrLo1t665P4nlYznrMTtK6r8e
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Do you want to comment on this nade?