As you lost the connection to the Servers before you made it to the teleporter, the Mission will not count as completed. You will have to do it again before Reset if possible.
If it's not possible, the Quest should disappear and you will have to hope to get Thunderlord from random exotics.
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Just now seeing that someone responded to this haha. Good news though, internet came back before reset, and there was no messing around the 2nd time. Got through it as fast as I could and got Thunderlord.
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Good to hear :)