Player asks wrong question and leads to wrong ruling
I had recently run into a problem at my LGS and I'd like to know how would you've acted in my situation.
This was an unusually large FNM, we had modern and standard and 3 draft pods going. I was not judging the event and was playing in one of the drafts, when two players from a different draft pod came to me. One of them asked me if I could help them with a Judge call, and I asked my opponent to give me a moment and went to the players. I asked the player if he wanted me to follow him to his game, but he said it was not necessary, as he wanted to ask something that would affect his play and he didn't want his opponent to listen to the question.
The player then asked me in approximately these words “when damage is declared, can I respond?” and then I stopped him and asked damage from what? when? he would need to be more specific… Then he said “during combat, after blocks, when damage is declared, can I respond?” and then, as I was still unsure about what was going on, I said that combat damage did not use the stack and, during the combat damage step, all damage was done at the beginning of this step and players could not respond to damage, which I understood was the answer for his question. I asked him if this answered his question, he said yes and went back to his game and I went back to mine.
Later in the event, another judge came to me and questioned me about having told a player that he could not respond to declaring the order of blockers, and I was surprised because that was not AT ALL what I've been asked.
How would you have acted in a situation like this?