At the same time, William wanted to unveil the mystery about such an enemy and know what was really going on.
He shifted his thoughts towards the things he could control. For example, that landmine plan was a must to do. Once he got his hands over maps of the Blue Hills, he'd start selecting spots where they'd spend some time preparing their killing zones and escape routes.
William always kept an eye for an escape route since day one of him returning back in time. As for the killing zones, he had to prepare places filled with landmines, lots of grenades distributed to kill any single enemy trespassing it.
Oliver and the other four learnt a lot from William. One of these was how to plan out grenades in a way that wouldn't be as rudimentary as William experienced before.