Can you use Baited Hook, then stack Altar of Souls on the trigger so that Altar resolves first before Baited Hook finishes resolving?

Ruling: No, you cannot interrupt Baited Hook's resolution with Altar of Souls. When Baited Hook kills a unit, Altar triggers as pending on the chain but must wait until Baited Hook completely finishes resolving before Altar can resolve.

Sequence:

• Activate Baited Hook (pay costs), the ability goes onto the chain and finalizes (choose which unit to kill but don't kill it yet)
• Reaction opportunity
• Baited Hook resolves: kill the unit
• Altar triggers and goes onto the chain as pending
• Baited Hook continues resolving: look at top 5 cards, choose a unit, banish it, then play that unit
• The unit goes onto the chain as pending, on top of Altar
• Finish resolving Baited Hook by recycling the other cards
• Finalize Altar on the chain
• Finalize the chosen unit on the chain (choose location, potentially pay additional costs)
• The unit immediately resolves
• Reaction opportunity on Altar's effect
• Altar resolves: choose whether to exhaust it to do its effect or not

Nuances:

• Altar is only exhausted when it resolves, not when it triggers
• The unit from Baited Hook is banished due to Baited Hook errata