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Attacking up the stairs from below was the only option, as this was a shopping mall where the stairs went straight up without the turns found in residential buildings, and the stairwells above would block the line of sight and firing range from the third and fourth floors, so they just had to deal with attacks from the second floor.
Attacking from below was highly difficult and dangerous, especially with grenades to be wary of, and the only piece of good news was that anyone shooting from above would have to lean out or at least extend their weapon to hit them, so with around twenty people blocking, they could ensure minimal enemy fire while ascending the stairs.
If there had been ample time, Gao Yang would have chosen another way, but with time pressing, they had to push through regardless, and all he could hope for now was that the enemy had not saved a large number of grenades for the impending indoor combat.