When he set his horse upon Evalcus, the Spartan stepped aside and had almost cut off with his sword the bridle-hand of Pyrrhus; as it was he hit the rein and severed it. Pyrrhus transfixed the Spartan with a thrust of his spear, and at the same instant fell off his horse, and fighting on foot, at once proceeded to slay all the picked band which was fighting over the body of Evalcus.
Edition :
Plutarch Lives IX: Demetrius and Antony, Pyrrhus and Caius Marius, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 101), Harvard University Press: Cambridge/MA - London 1968 (first ed. 1920).
Remark :
victim: The victims are part of Areus' army. This is mentioned in 30.2. thirdperson: Pyrrhus attacked these Spartans together with his Molossian horsemen. This is mentioned in 30.5. date: The date is taken from the New Pauly.
http://referenceworks.brillonline.com/entries/brill-s-new-pauly/pyrrhus-e1015710 motive: Pyrrhus attacked the Spartans out of grief for his fallen son Ptolemaeus. This is mentioned in 30.5.