it's not the top of the library where all the npcs are it is the smaller building also with the open roof you have to get on top of the taller building, go to the corner where the ribbons connect the buildings and jump over. that's where the point is.

quest can be gotten from a guy just east of Marak Farm, elevated from the fighting on the road. can't believe there was no location data for this posted yet

马拉克农场东边跟红狼对峙的地方，右边高台有个NPC给任务“撤退信号”获得。