I am a quite shy person ad often, when i find an interesting composition-subject (like a person doing something, a goup of people in a nice setting etc), i struggle to capture it because i feel like i’m being rude taking pictures without their approval, but at the same time i think that, by asking them, the spontaneity of the shot would be compromised. What’s your take about it?
Take the photo, then flag them down so you can show them. Explain that you took it before asking so as to capture their natural appearance rather than a posed one. If they want it deleted, just delete it. Otherwise hand them a card so they know where to find it online later.
Source: I did party photography for 10 years.