If I use Angle Shot on an already attached equipment, do I have to detach it?
Yes, you must choose one of the two options provided by Angle Shot.
According to the card text, when you play Angle Shot, you must:
- Attach that Equipment to that unit, OR
- Detach that Equipment from that unit.
Because the card gives you a choice between two specific actions, you must perform one of them. If you choose to detach the equipment, it will be detached from the unit it is currently attached to.