The cat was out in the yard when a deer wandered in. They faced off: 11 pound cat vs. 125 pound deer.
The cat must have decided that the deer looked pretty much like our neighbor’s goofy harmless dog, who the cat regularly chases out of our yard. And the cat knows that this 3/4 acre of the planet is his sovereign territory. So the cat charged headlong at the deer, who turned tail and ran.