>>15996953the way punk is doing it here is incorrect when it comes to technicalities, but it's not completely ineffective at trapping the legs, it's just not optimal
here is a correct (bret example) way to do it
notice that the outer leg of the opponent is flexed in and trapped by his other leg, bret's leg, and bret's chest, while the inner leg of the opponent is crossed over to keep that flexed leg trapped, and bret can also establish a hook with his leg holding arm to keep it together
in variations you can establish a kimura grip to cinch it, but i don't think bret does either