"there is a last sweet and kind,
was never face so pleased my mind
I did but see her passing by
and yet I love her till I die
Wordsworth, Keats, Byron, Shelly, Coleridge
If I'm understanding you correctly (sorry, I'm new at this) It sounds like you are describing an accident that either didn't actually happen, or was minor compared to what could have happened. I would call this a "near miss" or "close call"
Explanation:
For example: I had a near miss today when a dog ran out in front of me.
Or: He had a close call when his foot almost slipped over the edge of the cliff.
I believe the answer is A hope this helps
