No. It doesn't look like there is enough control of the opponent. His arms are crossed but not locked up. His body is free to move into a better position. Like others have said, get control from the back.
Yes, I've heard most of the Southern kung fu styles practiced on boats at some time or another.
We do quite a bit of low stances in the forms and drill work. We utilize the strength it develops in rooting and attacking an opponents stance/legs. That being said, you have to fight on all...
I would do two movements as close to simultaneous as possible:
1. Use his leg jam attempt as an opportunity to counter with a knee/leg lock or sweep.
2. Rotate both hands towards my centerline & smack his hands together.
I've been with Yee's Hung-Ga for awhile. Of course there is a little bias but the differences between us is marginal. I would place more importance on your impression of the instructor(s) than lineage line.
The best seminars are the ones given by my SiGung Frank Yee (Yee Chi Wai). He has amazing martial skill and truly cares that you 'get' what he is teaching.
The worst was a BaGua seminar I attended with a strained knee - it was torturous.
From my experience, most CMA's would disagree with this claim.
1- My 'insert style' is better than yours.
2- Same universal strategery found in all martial arts. ;-)
3- Move from dan tien & keep body alignment.
4- Each style has different footwork principles. For example, Tai Chi does not...