The lady seemed to be in a truly bad shape, but she was still alive. Her heart was still beating, even though extremely slow and extremely lightly.
It was quite a surprise to see that her accompanying ladies and Cyclops had all three run after the assassin, leaving her there to recover from the poison alone, but this was a great opportunity for Roy.
Making sure that this wasn't a trap against him, and that those three had truly left in pursuit of the assassin, Roy quickly took off the camouflage from himself and pricked his forefinger.
With the blood coming from his finger then, he started preparing the symbols for his Blood Slave Seal on the poisoned beauty.
Like this not only would he save her through the immunity of his blood, but also turn her into his slave. He felt quite lucky at that moment, he had truly picked up a gem this time.