Ogres don't spawn unless 1 condition is met.
All LIVING members make it across bridge.
This means all across, or as little as 1 across with the rest dead.
Can also trick the game into thinking you're dead by going off the map (I.E. Top of the tower)
The enemies on the near side despawning isn't the reason people wipe/Rez, it's a byproduct that happens when you initiate part 2 of the encounter: Wizards n' Ogres.
If those near-side enemies haven't disappeared, Ogres aren't coming.
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Also acolytes shoot...