When are targets chosen for Ruined Rex's Deathknell with Baited Hook?

LeBlanc Baited Hooks Ruined Rex, finding Harnessed Dragon, while the opponent has Ferrous Forerunner. They want Rex's Deathknell to kill a token after Harnessed Dragon kills Forerunner.

When are targets selected for Ruined Rex — before or after Harnessed Dragon resolves?

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•Riftbound Community Server — Rules Questions

TargetingTimingTrigger

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When are targets chosen for Ruined Rex's Deathknell with Baited Hook?

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