Ahhh, so that's the problem. Imagination.

[A shake of his head again, the flick of mandible against jaw meant to be a grin. Maybe with the teeth visible it kind of looks like one.]

Willpower, check. Imagination? Limited. [It's mostly joking. Self-disparaging kind of humor.] Unless you need something blown up or calibrated. Then, I'm your man.

Garrus.

[The last bit said with his hand extended in greeting.]