Sasless - no crystal ball, just the official sources quoted in FA18's post. If what they (including the director of the CIA) say is correct then someone didn't cover all the bases in their pre-flight planning - usually SF ops are planned meticulously, as far as possible, and predicting recirculation from such a LS is not rocket science.
High spirits - if the op was launched from Tarbela Dam they didn't have far to fly and even so, 12 heavily armed SEALs is still a hefty payload.
I have fallen out of the sky flying into a similar sized and equally high walled (albeit wriggly tin) LS and landed much harder than intended - not hot, high or particularly heavy - just caught out by the massive power requirement to hover when the whole disc is experiencing recirculation.