Map 13;
(filename; leonHL2-2l.bsp)
On a cut scene you see those 2 running away again and you have to go after them. Don't forget to take extra ammo out of the ammo crates at the start of the map. Once you come to a small bridge take cover behind a glass wall on the right side in front of the bridge.
Of course could you try to go over the bridge and hope you will get there alive at the other side, but there is a much easier way to get to the other side. Look in front of that glass wall that is in front of that bridge. You will find a hole in the ground, jump through it and you see another bridge under that first bridge. This will bring you in a much saver way to the other side. Once you get up the stairs on the other side you will be attacked by fire, explosions, manhacks and combines. In front of you a door will open and a combine will shoot at you.
Go through that door, you can leave it open behind you but can also close it with a button on the left wall behind the door. A new cut scene will show how those 2 take an elevator to get away from you. Follow the road that they took, but be aware.
Wait a bit when you're in the beginning of that hallway, because when you run straight through you will get killed by the explosions. So wait until the large hallway starts to fall. When you get below on another level go to the elevator where some extra combines came from, step in to it and go out at the other side.