I don't know what I'm doing wrong or if I'm doing anything wrong but I'm in the vex incursion zone and I'm trying to find the strand sources to bond with and I can't find any. I've been here long enough to complete the first part of this step of the quest, which is open chests, collect resources, patrols, and public events but I have yet to see a single Strand source. I've been wandering for almost two hours now. Any ideas what I am doing wrong?