Stop me if I'm wrong, but doesn't the serum provide some sort of healing abilities? Because if so, then Slade could (be fanwanked as) be concerned about stopping the damage and healing the wound first/stopping her from having a panic attack.
His expression in the second and third panels depict him as very unhappy about the situation. To me, he looks like he's just realized Rose can't continue this way, and I wouldn't be surprised if this were retconned further as the moment when Slade started looking for a good home for her.