Here's some evidence.
He's not there for the food. It's cracked corn and he has no interest in it. He sat there and waited while the ducks came up from the pond to feed. They paid him no attention at all, finished a leisurely meal, then strolled away.
He got distracted -- can cats have ADHD? -- but stayed there. I'd say that he was lulling them into a false sense of safety, but honestly, that would be a plan, and I don't think Irving can plan things.
Corky, the big Muscovy duck, stayed until the others had left, probably as a protective measure, but he also didn't seem disturbed at all by Irving's presence.
Irving seems more disturbed by my presence than the ducks. He's got a huge duck with claws behind him, and he's upset because I'm taking a picture?
Irving, what are you up to?