Glossary
Off-angle
In one line: An unusual position where the enemy does not expect you, so they are not aiming there.
What it means
When an attacker enters a site, they clear the standard angles: the ones defenders usually play. An off-angle is somewhere a bit unusual, where they do not put their crosshair. Playing one buys you the half second that decides the duel.
The price: off-angles often have no escape route and only work once. Use the same off-angle every round and the enemy learns it and checks it.
An example
Everyone holds B from behind the boxes. You set up in an open spot by the wall, where nobody looks when entering. The first attacker clears the boxes, shows you their side and you take them. Next round you change spots.