OK. Thanks everyone. Yes, a sample would be a good idea. Should have seen that one coming.
I don’t have my work with me at the moment, but should be able to dredge up something pretty close:
“No, no,” he said, eyes wide. “It wasn’t like that! It was… uh, I mean, I saw the whole thing. It was an accident, a horrible accident. He came stumbling through the ruins, arms full. He, uh… he tripped and fell. Everything scattered. And that’s when it happened.”
Something like that anyway. I think it’s a tad better in the story, and it makes more sense in that context. Also, this is the character at his most awkward. When he’s less stressed out, he speaks a bit more fluently, but still does this a little.
He’s not going to have a ton of dialogue in the story. But he is an important source of certain, crucial info at times.
Weirdly, the "uhs" are making me wonder if the character is lying. I frequently see "uh" used this way - to indicate a pause while the character is formulating what they're going to say next. When the "uhs" are coupled with ellipses (which generally indicate a trailing off rather than an interruption of a speech pattern) it doubles up on the hesitation.
Given that your character seems to telling his story with some urgency, I'm wondering if using em-dashes in lieu of "uh" would show his distraction better, e.g. "It wasn't like that! I was - I mean, I saw the whole thing."