I was once in his house and a woman was in his kitchen, or side room, maybe (sometimes the gabbaim allowed women in, i don’t know what it depended on, I had heard this woman asking before I went in; apparently ,permission was granted). It was the end of the night, R’ Chaim looked very worn out, anyway, he looked up a bit (seemed to me the way I might stretch my back, like being a bit worn out. I might be wrong about the exact psychology behind his looking up and slightly to the side. Anyway,) he saw her, and instantly, as though his eyes had been burnt, looked back down.
(One last parentheses: I don’t think the woman was supposed to have made herself visible to R’ Chaim.)