The building really was against them. Steve could feel the stairs getting flatter, turning from steps to slide. In a split second he made the decision he would always make in this sort of situation: save someone else.
"Get to the police station! Warn everyone they're pushing towards the center of town!" Steve shoved the shield underneath Hale's feet and threw him up the last foot of stairs. He was a hell of a lot heavier than Natasha and without the best footing it was a messy thing but he got him up. "Do not stop running!"
The cost was Steve slid back down towards the horde. He turned onto his back, got the shield up and prepared to go down fighting. Maybe if he was at full strength he could get out of this but he knew with grim acceptance that this number of undead and his flagging stamina was a death sentence.