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The healthy biker analogy doesn't have much bearing on this scenario
for a couple reasons:
1) a biker weighs maybee a couple hundred pounds. A T.rex weighs five
2) The fast moving (70 mph) biker is hitting the ground at an oblique
angle, so the most of the force is forward, along the ground, not into
it. The speed is bled off (albeit somewhat uncomfortably) rather than
violently halted. What if, after flying off your motorcycle at this speed,
you smacked straight into a brick wall? I doubt you'd get away from that
with a few scratches. The T.rex is going somewhere between
15 and 45 mph (depending on your take on dinosaurs) and, as mentioned, is a
LOT heavier. There isn't going to be a lot of skipping involved. You
spike a 10,000 lb animal headfirst into the ground at 15-20 mph, its not going
to brush itself off and walk away. One should be careful about
anthropomorphizing the effects of mass and gravity on animals so very, very
much larger than ourselves. They have concerns that we don't, at least
not to nearly the same degree.
Also, as far as the relative strength of T.rex's skeleton, refer
again to the same paper. The calculated "strength indicator" for T.rex
isn't much more than for an elephant, and doesn't even compare with a
modern high speed runner like an ostrich.
By the way, having re-rerotated ceratopsian elboiws inward,
could they gallop?