When Hidden Blade kills Undercover Agent and the opponent draws 2 cards (one being Gust), can the opponent play Gust before the Undercover Agent's Deathknell trigger resolves?

Question

Accepted Answer

Ruling: Yes, the opponent can play Gust before the Deathknell trigger resolves.

Sequence:

Hidden Blade resolves, killing Undercover Agent and drawing two cards
Deathknell trigger goes on the chain
There is an opportunity window for Reactions (like Gust) before the Deathknell resolves
After Reactions are played or passed, the Deathknell trigger resolves