Impossible Sparring Challenge

Ok… im probably super late to this but i figured it out! It says to, “TRANSITION into full guard and hold L stick the left (or other directions)” so, for the challenge you immediately hold left on L stick after your transition. So for me, challenge 3 of 4 was “hold opponent in fullguard for 3 secs” so during that 3 secs i was holding defense and pushing towards the appropriate directions until he stopped… i let him do it one more time, and IMMEDIATELY held left on the L stick. Held it until he got into submish pose then used the normal R stick + L2 submission prompt! Bingo bango good to go go 👍. I havent tested it but im pretty sure if you just hold the L stick left or what ever direction it tells you, it will perform the whole submish, kinda like on getups. But yea! Thats it, thats how you do it