Library drama
The main attack routes of the library are the path on the first floor and the long bridge on the second floor. Long bridge is not suitable for submachine guns because of its long fighting distance.
Therefore, 98K suggests that you start from the arch on the first floor, get stuck behind the desk in the middle of the trail, and use the advantages of bunkers and third-person vision to intercept and attack enemies attacking from the other side of the trail or the middle road.
You can also start from the first floor to the enemy's secret passage, and harvest the returning enemy at the slope position facing the enemy's return point on the second floor. To tell the truth, this is really tried and tested, and it is said that it has been used!