- Alice casts Languish.
- Nathan casts Gods Willing, targeting Favored Hoplite. He announces that Heroic and Prowess have triggered.
- Alice acknowledges.
- Nathan resolves God's Willing. He scries 1.
- Alice resolves Languish.
- Nathan puts Seeker of the Way into the graveyard.
Nathan waits for a few seconds and then asks if it is his turn. Alice states that Favored Hoplite is dead. Nathan says that he forgot to put a +1/+1 counter on it from Heroic. Alice claims that the trigger was missed.
The Tournament Rules (TR) define a missed trigger as:
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.
By the TR definition, the trigger was missed, because Nathan has taken an action beyond the point where the trigger would have an observable impact on the game.
The Infraction Procedure Guide (IPG) defines a missed trigger as:
A triggered ability triggers, but the player controlling the ability doesn’t demonstrate awareness of the trigger’s existence the first time that it would affect the game in a visible fashion.
By the IPG definition, the trigger was not missed, because Nathan demonstrated awareness of the trigger's existence long before it would affect the game in a visible fashion.
I must be misinterpreting one of the two documents. Was the trigger missed or not? Please answer for both Regular and Competitive REL, and make it clear if they differ.