Well in the sim at least I can say you don't get a noticeable yaw in a engine out flare.
Not sure why your interest but I'll add as an IMHO that I wouldn't "overthink" the 777 TAC....from this non trainer end users POV my bullet points on it are:
1. It doesn't always work (see FCOM).
2. It doesn't kick in fully and instantaneously, so you still need to think/use your feet...and not just on a potential E/O takeoff but also on a potential E/O go-around.. (see FCTM/FCOM).
3. Until you are used to TAC it can feel a bit strange when it does then catch up with what your feet have done/are doing (e.g. Rudder pedal forces changing as it runs).
Having converted from a long time on a "traditional" type to the 777 I must admit I found point 3 darned disconcerting until I got my head round it.
Rest of what it does to me at least seems pretty much invisible.
Last edited by wiggy; 21st October 2017 at 08:42.