Marco spent the morning reinforcing the area. He successfully crafted an outer fence outside the barricades. With the outer fence, zombies would have no reason to get closer unless they're being led or there was too much noise in the apartment area.
He also found a slight upgrade for the wooden arrows. Through the creation platform, he was able to make fletchings from hard plastic.
With the extra weight on the arrow, together with a stable course path, bow training has increased in progress. Even he who doesn't have much experience in using bows was able to send the arrow toward the right direction on his first try.
Marco was eating lunch with Jessica in his room when two people climbed over the outer fence, barely escaping the pursuing zombies. They only found out about the situation when the strangers' voices started to rise due to frustration.