Very good point, I didn't mean to conflate it happened in the last 100 years, more so the data of their deaths that I had access to had that timeliness.
Even arrows or spears wouldn’t have been long enough to develop such a trait. And with those tools, still I don’t think Tiger would have been a primary target for humans. Seems like for most societies felines and canines were just not things we eat. Though maybe hunted for the pelt? In which case maybe they do eat the meat?
Also statistically (since we're talking evolution) it wouldn't help much against humans, we've got good vision and intellect, the chances to fool us enough times for this adaptation to arise are slim.
i mean i'll concede that it's not entirely ineffective, but i very much question that it would significantly affect their survival.
If a human sees a tiger which they know may well kill another human, they're not going to give a toss about where the tiger is looking, they're going to have 5 friends with them who all carry the best weapons they have available to turn that tiger into a rug.