The third Sigma Stage is essentially a big boss rush. I have to face the five remaining Mavericks plus the stage boss, D-Rex. While it isn't that bad if you use the Maverick weapons, this stage can be hell if you're doing a buster only run, especially since you have to deal with both Sting Chameleon and Armored Armadillo again.
The next video will be the final stage and ending. Enjoy!