Both losses were attributed to AAA, whether a hit or a threat reaction to it, is unknown. The VA-36 A-6E was reportedly hit by AAA while in the area of the island, ingress if I remember. And Karma 52, the F-111F was ingressing the target when it was assessed to have been hit by AAA, however unknown whether that was targeted or they ran into barrage-type fire. Personally, I think that's a guess, as it could've been a threat reaction into the water too; as all that was seen by other F-111s in the flight was the explosion on the water and nothing else.
It's notable in Karma 52s loss, that going in low was due to the need to stay under the radars, even though the USN was performing SEAD for them with A-6E and A-7Es off the coast, and EF-111As were also providing SEAD via jamming (EF-111As are unarmed). The missio would've been a good one for the F-117A, however the combatant commands didn't know of the existance of the F-117A even though they'd been operational and mission capable for at least 3+ years by that time, but were still a black program.
But indeed, threat reactions at night leave little to no room for error, much little to no room for maneuvering.
Granted, no F-111E/Fs were lost in Desert Storm, but when A-6E units went to medium altitude during their night employments, their damage/losses went down significantly. And even though they were LGB capable, the VA units were primarily only employing dumb bombs in their strikes. Only "usual" LGB droppers in Desert Storm were F-117, F-15E, and F-111F units. Others were only dropping LGBs sparingly, or not at all. F-16 at the time, wasn't LGB capable from a self-lasing standpoint.