people have already answered you... but you seem to be asking redundant questions.
You must Kill your appropriate Knight and the main Boss within 30 seconds of each other. The other two nights you can kill any time. It doesn't matter. If you have 2 people with the same sword... it doesn't matter because both of you have the same Knight that needs killed.
If you have two different swords... either do this quest 2 different times so you only have to worry about one knigt. Or you can do it in the same turn... you just need to kill the 2 knights VERY fast, and the boss all within 30 seconds of each other.
There should be no confusion here.
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I still had the question about whenever if we both had the same sword (void) but someone already did it. So calm down