You have to understand that while you're there looking at Bam and wondering what planet he's from, his wife is sneaking up behind you with a frying pan. 
Substitute "gypsy" for "ninja" if helps you think outside the box. Would you expect a gypsy to stand up and box with you? Hell, no. He'd throw dust in your eyes, pull out a razor, sic a monkey on you, do any and all kinds of offbeat stuff that no dojo would ever think of covering. (I first heard of muay thai in the Modesty Blaise books, and she used a documented ninja trick -- she flashed her tits at the bad guys while her partner snuck up behind them. Called it "The Nailer." Might keep that in mind next time some chickiebabe gives you a free peek.)
What "mechanics" a ninja would use to defend against a thai kick, I have no idea, but messing with your timing and changing the distance are both no-brainers. Are your knees anywhere near as tough as your shins? It's a small target, but a broken knee's a fight-ender and you're giving the defender a lot of force to work with.
And what self-respecting ninja strikes with an empty hand? The world is full of rusty nails and broken glass.

Substitute "gypsy" for "ninja" if helps you think outside the box. Would you expect a gypsy to stand up and box with you? Hell, no. He'd throw dust in your eyes, pull out a razor, sic a monkey on you, do any and all kinds of offbeat stuff that no dojo would ever think of covering. (I first heard of muay thai in the Modesty Blaise books, and she used a documented ninja trick -- she flashed her tits at the bad guys while her partner snuck up behind them. Called it "The Nailer." Might keep that in mind next time some chickiebabe gives you a free peek.)
What "mechanics" a ninja would use to defend against a thai kick, I have no idea, but messing with your timing and changing the distance are both no-brainers. Are your knees anywhere near as tough as your shins? It's a small target, but a broken knee's a fight-ender and you're giving the defender a lot of force to work with.
And what self-respecting ninja strikes with an empty hand? The world is full of rusty nails and broken glass.