I have seen this video, anyone has noticed that?. It seems that in remastered strike of Omnigul a rune can be activated, not in normal strike, only in the Dawning version. Maybe nothing, or maybe something hidden...
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If it is anything it will only have relevance when onnigul is the nightfall. Suggest you check what effect backtracking through there has during a nightfall. Could perhaps lead to an alternate misson ending such as the black spindle one.