Assertion: american bison's head | /r/CapableOf | tumble into the water
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Source sentences:
text: As we were drifting by these, and supposing ourselves out of danger, I drew up my rifle and shot one of them in the head, which tumbled into the water, and brought with him a hundred others, which plunged in, and in a moment were swimming about our canoe, and placing it in great danger.