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taking a fall

Concerning the pretty much untestable idea that Tyrannosaurus was so big that 
it would be at excessive risk if it dared run too fast, I was struck by the 
photo on p. 112 of the March Natl Geo. Shows a mountain goat on a vertical 
cliff with a looooong way to go if it missteps by just an inch or two. Talk 
your extreme lifestyle, a fast running Tyrannosaurus would be a conservative 
risk taker in comparison. Would like to see how the risk factor could be 
calculated if cliff climbing ungulates were known only from fossils. Mountain 
do occasionally fall and die, and no doubt running Tyrannosaurus did too, but 
life is dangerous. 

G Paul