What actions constitute passing priority?
I disagree with the ruling made by the floor judge. I also disagree with upgrading the penalty to a warning.
Ruling
First, let's get some terminology down:

You are the controller of the trigger.
I interpret &quot;action&quot; to mean &quot;game action&quot;. For example:

Resting your hands on your lands is not a game action.
Untapping your lands is a game action.
Silence is not a game action.
Saying &quot;Sure.&quot; is a game action.



The following is an excerpt from the Infraction Procedure Guide:

Players may not cause triggered abilities controlled by an opponent to be missed by taking game actions or otherwise prematurely advancing the game. During an opponent’s turn, if a trigger’s controller demonstrates awareness of the trigger before they take an active role (such as taking an action or explicitly passing priority), the trigger is remembered.

What this says, quite clearly, is that your opponent cannot cause you, the controller, to miss a trigger by drawing a card, playing a land, or otherwise advancing the game without your active consent. You never assumed an active role before remembering the trigger. Therefore, you didn't miss it.
This is reinforced in the Tournament Rules:

Triggered abilities are considered to be forgotten by their controller once they have taken an action past the point where the triggered ability would have an observable impact on the game.

If your opponent had said &quot;Draw?&quot; and you respond with a &quot;Sure.&quot;, then you have assumed an active role by explicitly passing priority. In that case, the trigger is definitely missed.
Penalty
Missed triggers should only be upgraded to a warning if the trigger is considered detrimental to its controller. The game state is not a factor in determining this. As noted in the IPG:

Upgrade: If the triggered ability is usually considered detrimental for the controlling player the penalty is a Warning. The current game state is not a factor in determining this, though symmetrical abilities (such as Howling Mine) may be considered usually detrimental or not depending on who is being affected

According to an L2 judge on Reddit, neither side of Duskwatch Recruiter is considered &quot;generally detrimental&quot;. It may be situationally detrimental, but according to the IPG, the judge awarding the penalty should not be using the board state as a factor in determining whether the trigger is detrimental.