Annan really wanted to tell the blackbird that he was actually a Gold-tier Transcendent.
Moreover, Annan possessed the Elemental Power that could detoxify poisons and the ability to counteract concealment, as well as Summons specifically designed to defend against assassins...
Even if it were a Silver-tier destruction Wizard, Annan would need to be more cautious—perhaps even leave this unsafe city as soon as possible.
After all, a Silver-tier destruction Wizard could indeed be lethal.
If one in the eastern side of the city were cornered and decided to detonate himself with full force, Annan on the western side wouldn't sense a destruction Wizard exploding. A sudden explosion could injure him seriously, if not severely...
And if he were to brace himself, either read a spell at Annan—blow himself up close, or get hammered to death by Annan at close range.