Even if unwillingly, he also spared:
Michael, Angel, Saul and Burt. They encountered him. Ink tried to attack them, but was downed. So he fled.
But more interestingly: Why did Ink knock against Burt's door in the Tower instead of following the scent left by all the Towerites? Hi did not chase or attack them. So - kind of - he left them, too.
But what was it that attracted his attention to Burt's armory?
And this, too!
=> These leads me to the assumption that "something" maybe be different with the people from the Tower.
Best wishes!
Liam
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