After crossing the cavern with the floating platforms, as shown in the previous section, follow the tunnel down to the LIBRARY.
There are 2 undead knights (1-2) lurking inside on the left. Knocking them down twice with melee attacks or weapons will destroy them permanently. You can also just try to avoid them. But for the "This is Lara!" achievement/trophy, you'll want to lure them back to the CAVERN and knock them into the pit. Start by getting their attention...
...then run back along the tunnel the way you came.
When you come to the edge of the pit...
...wait for the knights to approach, then backflip over them. (Or turn around, run/jump past them, then turn to face them.)
The goal is to maneuver one of the knights between Lara and the edge of the pit. Then punch/kick (Action) repeatedly to knock it back...
...until it falls off the edge.
Then repeat with the second knight.
Take care not to knock them down twice without sending them into the pit, since this will destroy them, and it won't count. Heal during the fight if necessary, but if Lara takes a little damage here, you can probably continue without healing. There are no more enemies before the end of the level, just some climbing and swimming.
NOTE: These are knights 14-15/17 for the achievement/trophy. The last two are in the final level, ECKHARDT'S LAB. If possible, check your progress (such as via the Steam achievements screen) before moving on.
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