Two things happen very nearly simultaneously: the blade rips into Anders's moving body, missing the artery but dealing a heavy wound.

And fairly nearby, still concealed but aware that the time for concealment is over, Cassandra gives a shrill piercing scream.

Anders swears viciously under his breath, and lashes out in return -- first feinting at Phil's throat, then striking low at his thigh, scoring a line of blood along it. In the same motion, he turns to bolt down the corridor, staggering badly until he's able to slap a quick healing spell on himself.