If you are not a king, Jerusalem would not be handed over into your hands: Even though it was not yet handed over into his hands until Titus arrived - since he already was besieging it three years and there was a famine, it was nevertheless as if it was already handed over.

And a miracle was performed and blood, etc.: To make known that the destruction of the Temple was arduous before the Omnipresent.

And picked at his brain for seven years: He did not become a tereifa (one who has a wound or condition that will lead to his death within twelve months) with this. For it entered through his nostril and did not pierce the membrane [of his brain]. Moreover (alternatively), there is a distinction between [what causes the condition of being a tereifa in] people and animals, as I explained in the first chapter of Eruvin (Tosafot on Eruvin 7a, s.v. Kegon).