What a Feeling!
Hear my soul speak.
Of the very instant that I saw you,
Did my heart fly at your service.
- The Tempest - Act 3, Scene 1
Optimus had warned him of the spiders.
But when he finally lays eyes upon Blackarachnia, lying wide-eyed in the dirt, he feels his resolve crumble; who is he to harm such a beautiful creature as she? Even grime and damage cannot hide the fierce splendour of her frame. And so, he speaks of his unwillingness to harm a female, and instead does battle against the Fuzor, thereby gaining blessed release in combat from such traitorous thoughts.
For even knowing her to be an enemy, he still cannot stifle the quickening in his spark at the fleeting quirk of her smile.