Chen Ke and Sam pressed their shoulders against the rolling shutter door, glancing at each other.
"3, 2, 1, push!" Sam said.
Together they exerted force, feeling the rolling door dent significantly due to their effort, but it was blocked by something heavier outside.
Judging from the weight, the obstacle outside seemed to be similar to sandbags or cement bags.
"Keep going, push again," Chen Ke said.
They both exerted more force, pushing the rolling door further outward, feeling the friction from the heavy object behind it, but there still wasn't enough space.
Sam looked down at the survivors below and said, "We need a few strong men to help."
Soon, three men volunteered to step up, but the staircase could only accommodate four people side by side.
"Whoever gets tired, rotate out," Chen Ke said.
Thus, four men continued to push against the door with their shoulders.