Act 2, Sc. 2, lines 465-472: What words are used to describe Pyrrhus as he pursues his quest of revenge and what purpose does this language serve for Hamlet?

1st Player. Then senseless Ilium,

Seeming to feel this blow, with flaming top

Stoops to his base, and with a hideous crash

Takes prisoner Pyrrhus' ear. For lo, his sword,

Which was declining on the milky head

Of reverend Priam, seemed i'th'air to stick;

So, as a painted tyrant, Pyrrhus stood,

And like a neutral to his will and matter,

Did nothing.