Henry
Autoexreginated
The rest - turning the arrow around and stabbing with it - is simply flavoring the mechanic.
As Stoat points out, he didn't need Throw Anything; the description of arrows has rules for using them as hand-weapons.
As for Tarquin, I do believe his son will eventually be his undoing, indirectly or directly, through his attachment or through severely underestimating him. As Elan would point out, the Laws of Plot and Drama almost demand it.
