Both of the last kicks don’t have a bridge. Both are with your elbows back fist in arm pit
The Forms, Muk Yan Jong kicking technqiues and kicking drills in chi gerk all teach you to kick once you have a bridge…Controlling your opponents bridge or structure allows you kick low easier…since he is unable to escape!
Its simply a principle…Its hard to put into actual application unless you drill it and practice it relentlessly!