The first reaction a fighter must have when they get on all fours is to protect their neck.
Apart from that, through some sort of grip, it is recommended for them to control their opponent's movement. With these defensive measures in place, they can start thinking about attacking.
Among trap options is the daring yet subtle move Leo Tunico teaches here. Note that the moment he manages to laterally hip-escape, Tunico jumps over his opponent's torso and ends up in side control.