Unless, there was something going on in-game after returning from the store preventing you from checking your action logs, then yes, I could give you the benefit of the doubt that you couldn't check your action logs. However, after reading your appeal, there wasn't anything going on that prevented you from quickly checking your action logs to see if your revenge against Curious was still valid. The amount of leeway that we typically give is 1 to at most 3 minutes past the revenge time, but it also depends if you were in a situation that prevented you from checking your action logs (like driving your car while chasing the player up to a certain point).
Therefore, the infraction is warranted in this case, and if you disagree, then you'll need to bring your case to Karbz.