bro sentinels lost to tier 2 and tier 3 teams in the open qualifiers and they started winning when they signed rawkus back and he lead them to a comeback from the lower bracket

I have seen all of the teams use a viper ult in Icebox B site when they are attacking it is elevated from green and covers the plant area
i have searched youtube and reddit but didn't find a lineup and i tried it myself but couldn't get it does someone know how to do it?