Tech chase followup help

[Saint Shaden 009]

So, I'm a Marth main looking to pick up Shiek for matchups and I'm working on the air game and stuff a bit at a time. Also, I can chaingrab fine (M A R T H B O Y S) as well as boost grab techchase fine.

My main question is what to do when tech chasing spacies (Falco more so than Fox) to kill. Do I ftilt at some point to fair or upthrow to fair? Not sure tbh.

Help is much appreciated

 

[ECHOnce]

Pretty sure this vid goes over follow-ups to kill them/knock them off edge at some point (:

 

[Poccoishere]

You can use down air if you are comfortable reading techs to begin kill combos around 50-60% This is an amazing option because it combos into dair, fair and nair. The only downside is that it is a tad bit of a read but that is tech chasing to begin with.