When you first start off on the maw level, turn around
then jump out aim for the smooth big like a hill and you should slide down. It only takes a bit of health
off if not any and it may take a few trys but i can gaurentiee it WORKS !!
OH and another cool thing to try is wait at the start of the level for the sentinels to come and blobk them from getting through, they dont shoot you because they are still in travel mode I KNOW I KNOW this is point less but its just something to try.