What happens if 2 people in a raid group have the GRSS MOD, will the information be duplicated.

How is the best way to have another person in my absence do the raid info. should he record the data, then email me the .lua file or what?

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Only if both people upload their data. It's always a good idea to have more than one person running the GRSS on that off-chance that WoW crashes (losing your data). It's just a matter of coordinating who will do the upload.

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It's all in the reflexes.

Can the GuildRaidSnapShot.lua be sent to me from the other player so i can upload it

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Yup.

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It's all in the reflexes.