It worked fine. You can even see in the post-game graphs that you need around 200 damage with richochet
Here's some things that seem to have caused confustion:
1.Richochet has a 13m range
2.Richochet cannot trigger off objectives (Guardians, walkers, patron, etc), this was added intentionally in this update https://forums.playdeadlock.com/threads/07-04-2025-update.70156/