Chat her up while she's orking a cow
Could he be seen to be milking it as far as a coworker was concerned?
Is this episode just a drop in the bucket and pale by comparison with her other office movements and oeuvre?
At the very least he should ask her to come and have a look at something again.
I'd need to know more about the possible flirting in the past from a technical perspective so hope that he keeps us abreast of developments.
I may be over thinking about this but I doubt it.