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[Star Wars] Rogue One Spoilers

Why did Saw Garrera just give up? I guess I can understand narratively why his death fits, but it was portrayed as though he could just as easily have escaped with Jyn and company. I'm wondering if I'm missing some of his backstory (I only know him from Rogue One) that might make the "I will run no longer" line sound a bit less melodramatic.
gpt
He was using a mask to breathe, and it doesn't look like he adapted to that as well as our favorite Dark Lord.  It's uncertain whether he would have made it to the ship, or whether he's able to run at all.

He also seemed to be losing his mind a bit with his treatment of the defected pilot, really paranoid fellow and not without reason.  That probably was getting to him.

(He apparently has some additional backstory coming up in a to-be-released episode of Rebels)