You can strike a single bomb safely with a caber; it protects you from explosions travelling against the direction you are holding the caber. What makes this room difficult is that the bomb you strike causes other bombs to explode, and
those can kill you if you're in range. So the first part of the puzzle is simply finding the one safe spot where you
can set off the explosion chain without any of the explosions touching you.
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×The correct spot is...
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×exactly where Beethro is standing in your screenshot.
That doesn't completely solve the room, because it doesn't kill all the monsters, and you haven't done anything with the kegs yet. This has already been said further up the page, but what you need to do with them is:
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×connect the explosion to the other bombs, so that all the bombs blow up in one go.
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50th Skywatcher