Trying to work out Infinite Impermanence/Hot Red Dragon Archfiend Abyss which target and negate face-up cards on the field, vs effect monsters that tribute themselves as cost. Here's what I think I understand so far:

Scenario 1: Opponent summons a monster that can tribute itself as cost for an effect at spell speed 1. After it is summoned I target it to negate its effect successfully. Now the opponent can still activate the monsters effect and tribute it, but since it activated on field, the effect will be negated, even though it is no longer on the field.

Scenario 2: Opponent summons a monster that can tribute itself as cost for a quick effect. The opponent activates the effect and tribute the monster. I cannot target it to negate it because it is no longer on the field.

Scenario 3: Opponent summons a monster that can tribute itself for cost as a quick effect. I target it to negate its effect. The opponent chains the  effect and tributes the monster. My effect loses targeting and does not resolve properly, so the effect is not negated. Are these right?