I'm still messing around with the glitch a lot add me to psn bryant2010 if you wish to help me discover some stuff.
And yes the grenade is irrelevant as long as you keep tapping square as the power is turned on it works, you'll know its working because it will repear lunar lander navigation over and over till u hold square completely.
I'm finding a few new glitches, why I need help I may have found a few just need help as you need 2 characters, pain in the ass trying to keep 2 controllers alive split screen as I tend to hit the death barrier a lot when flying off the map accidentally lol I love these glitches I stuck a zombie in the wall on the stairs up to lander 3, was helpful to keep him out the way

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Is there currently any death barrier bypasses I can find a lot to do with this and I have a lot of wall breach and barrier ideas regardless of a bypass.