It's nice to do those things where there isn't an audience. Be considerate of the fact that they might want to keep their relationship business quiet or that if they want to reject you, don't want to look like an ice queen in front of people.
Pulling someone aside in public where other people can't hear seems like the best option.
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If your success is defined as being well adjusted to injustice and well adapted to indifference, then we don?t want successful leaders. We want great leaders- who are unbought, unbound, unafraid, and unintimidated to tell the truth.