Use of どこ in this sentence


Context: a girl is waiting for the speaker walking around an airport.

> アレじゃ待ってんのか牽制されてるのか分からんし

I don't have a clue about what is she waiting for, neither what is she
checking,

> ……しかも何度か目が合ったのに **どこ** 吹く風で。

... even when our eyes repeatedly make contact where (?) the wind blows (so
wind blows according to their glances?)

Is どこ even used without a question context?

Thanks in advance!

