That’s not an indication of competence. Briefly putting on my training hat as both a firearms instructor and an active shooter instructor- reholstering occurs at the end of the active part of a fight, when you make a decision that you no longer need your gun out. That’s at the peak adrenaline dump in a situation like this. We train people not to worry about or rush to holster- you’re past the key part of the fight at that point.
Reholstering involves fine motor skills, and looking off-axis from the areas you’re watching; in this case she was looking to put her gun away - appeared to reconsider - but was still in a space with some potential threat, so her head and eyes were up and scanning. She was also making sure she was in the right place in the protective box (which was super dynamic and fluid), and would have been absolutely hypervigilant watching the close crowd for further threats. She was in position, watching her arcs, and doing her part in the larger team getting the protectee to safety and away after shots had actually been fired. That’s exceptionally stressful.
But you don’t know these things, because you’re chucking shit completely outside of your arcs.