oh thank you, and sure.
In both of them you'll need some speed, uke must be coming to you fast, so they're pretty beautiful counters against those opener kicks.
In Sassae Tsuri Komi Ashi you'll just use your foot to "block" your opponent's outer foot while you pull his upper body to your backwards - preferentially while raising one shoulder and lowering the other in order to making him spin - this will create a powerful twisting motion which will allow you to take you opponent down. There are a few examples of it in this thread.
Tai Otoshi is almost the same. The great difference from sassae is that you don't use only your foot, but your entire leg to make your opponent stumble and spin. Like this:
The biggest problem of this move is that the mix "keep balance + avoid glitched grips + make your opponent fall" is pretty hard to achieve. But imo the secret is all about the way you spin to set the move.
