Reporting negative observations about a peer
Here's a touchy situation, although it might be pretty common. I would like some other thoughts to be sure I'm not missing something.
A peer and I were visiting a customer in a professional consulting capacity. As part of that visit, my peer gave a presentation about our product to about 60 people in the company, a mix of managers and non-managers. The presentation didn't go well at all and the reason was my peer's presentation skills. The litany of mistakes is long, but not really relevant. Most were pretty basic since group presentations aren't a core part of our job and are required once or twice a year at most. We ended the presentation with only 30 people.
This is too large to leave alone. Because of the poor presentation, we severely impaired a chance at additional revenue, probably 2-3% of our annual target and the image impact was pretty bad too. I don't want to approach my peer about this because his personality is very D/C and I don't believe he would accept it positively or that he would seek to correct the issues. That leaves talking with our manager. Focus on behaviors, professionalism and business impact while avoiding sounding like I'm hacking at my peer...this much is easy.
What other aspects should I be thinking about?