Matter, antimatter, space and time reload

Factual Questions
1

Lets try this again.

Matter and antimatter mutually anihilate into subatomic particles and energy.

Lets call this event point E.

The aftermath of the event is Post-E.
Before the event is Pre-E.

Feynman showed that an antiparticle going foreward in time behaves EXACTLY like a normal particle going BACKWARD in time.

So how come we do not also see anihilation by-products when we look backward in time Pre-E?

2

Because from the antiparticle’s point of view, it’s not an annihilation going on - it’s pair production. With pair production, you have photons before the event and a particle-antiparticle pair after the event.