After rescuing Ashley, Leon escorts her to the helicopter pickup. Hunnigain informs Leon that the chopper can't come due to the weather (the original RE4 stated the helicopter was shot down, later you learn Saddler's men shot it down), thus making the most fun part of the chapter, the cabin fight. In this remake, Leon learns about the virus after fleeing the cabin horde
https://www.youtube.com/watch?v=vtJdgrGx5aM