There's a large medi pack just beyond the trapdoor, but it's impossible to get it without being flattened by the rolling spiked cylinder unless you exploit a bug in the game. If you're dead set against cheating, then skip this pickup and continue with Part 3.
To get the medi pack, first jump over the trapdoor.
Trigger the cylinder by stepping down near the medi pack and immediately hopping back to safety.
Then face the cylinder, move as far to the left and as close to it as possible. Now jump forward repeatedly and Lara will gradually creep into the cylinder.
When you have reached the centerline of the cylinder, turn 90 degrees to the right...
...and continue to jump forward.
Once Lara is standing over the medi pack, pick it up.
Use the same technique to get out from behind the cylinder again: Stand on the left side of the cylinder, facing the trapdoor, and jump forward until you gradually work Lara through the cylinder and out the other side.
Turn around and drop through the trapdoor.
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