... The verse is talking about King R'tzeen of aram (damascus) and King Pekakh of israel (as mentioned in verse 1) being conquered by the king of assyria (Tiglath-Pileser). They were then both killed.
(The kingdoms of Aram and Israel were planning to go to war against the kingdom of Judah. King Ahaz (akhaz) of Judah asked the king of Assyria for help).
The hebrew word translated as "hired" is also translated in other places as, "officers", "mercenaries", "hired men", "great ones", "princes".
The word "razor" here means "swords" and "shaved" means the conquered kingdoms were "shorn" of the "head" (king), "legs"(soldiers) and "beard" (governors/advisors).
We know from non-biblical sources (inscriptions from Assyria) that this happened and that the king of judah, ahaz/akhaz, paid tribute to Tiglath-Pileser.
Too bad that PB wants to ignore what chapter 7 (and 8) is actually saying and keep deluding himself that this is about a ridiculous "virgin birth" of a messiah.
Sorry to interrupt your sex talk fun guys