O.|.O
.-O-B
O.|.O
O.|BO
.-O-.
O.|.O
Oh, whoops, I forgot that the thing turns when Beethro moves into it. So,
O\.XO X=dead Beethro
..O..
O/.\O
So Beethro can't move diagonally into it without getting killed. Or horizontally, for that matter.
Wait, so how did Beethro get into those locations in your diagrams?
Oh, so, in fact, he can't survive one even with a speed potion.
Scratch that. He can't survive one even with a speed potion if there's ortho squares.
Oh, look at that! A speed potion makes my last post valid.
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Also known as ExpHP everywhere else.