You mean Sasuke after fighting Ay, Gaara, and Mei? And Particle beams are subatomic laser beams that travel near the speed of light, so it's not like Sasuke can move that fast in a short amount of time after groveling in pain and exhaustion from Susano'o side effects.
Replace almost anybody in Sasuke's situation and that 90 year old fart would vaporize them. So why hate?