Resident Evil 4/Chapter 4-1

Trap
You must now merge Leon's inventory with the items that Ashley picked up. If space is tight, then combine the healing items as much as possible. You can also combine two partial boxes of ammo into one if the total is small enough. When you're done with this Salazar calls again, but nothing very important is said.

The natural impulse at this point is to continue north to collect the last missing piece of the relief from the audience hall in Chapter 3-1. We've got two of the pieces now, the Goat Ornament found in the gallery in Chapter 3-2, and the Serpent Ornament found in the storage room in chapter 3-4. But there are some some optional paths we skipped before because they weren't open, and some the areas that were cleared earlier now have enemies in them again.

So we're going to backtrack for a while and you can skip the next couple of sections. Alternatively, you can wait until you reach the audience hall again and then follow the same route again to cover the optional areas from a different direction.

Assuming that you're doing the optional areas, go west back though the armory, and into the refectory.

Refectory (optional)
More zealots have appeared here and if you didn’t fight the garrador earlier he will be back for you to have another chance at him. Immediately go left as you enter and go to the area behind the counter; it a long passage where you should be able take on the zealots even though you're outnumbered. There may be more monks in the dining area, so take them out as well; use the doorway as a choke point if they start to surround you.

Follow the hallway south and get two remaining jars at the end. Then go through the door to another area.

Fountain (optional)
You enter a storeroom. Before moving, equip your rifle and carefully scan the ceiling ahead for one of the Novistadors, the invisible insects from the sewer. Snipe it before it can cause any trouble, then step forward a bit and scan the ceiling around the corner to the right for another one. When you're satisfied that the room is bug-free, explore for items. (You can avoid dealing with the insects by getting these items in part 3. You would then go through the hedge maze to avoid coming through this room now.)
 * 5000 PTAS from a cabinet on the left as you enter
 * A pot on a cabinet to the right of this
 * Two boxes on shelves in the next corner
 * A Green Herb on the table
 * Two barrels on the southwest corner
 * Two pots and a box on the north wall, the right pot has a snake.

Break the lock on the door and go through. You're now at the end of the long hallway you came down just after leaving the gallery, having come through the door that was locked before.

Go west to the fountain as before, but this time stop at the window to the north noted earlier. Piggyback Ashley here to have her go through the window above and unlock the door. Go in to discover four treasure chests, our main reason for this excursion.
 * 5000 PTAS
 * Red Herb
 * Broken Butterfly
 * Elegant Perfume Bottle

The Broken Butterfly was for sale from the Merchant since entering the castle, but it wasn't worth buying because we're getting it now for free. It uses magnum ammo, which is rare so be very stingy with it. Basically only break out the magnum for tough bosses where you'll be very grateful for the extra firepower.

Head back to the area where you reunited with Ashley and go north to the next area.

Trolley one
You enter a room with a lava pit on the far side. There is a passage to the left which leads to a trolley, but we don't need to worry about it for the moment. Get the two pots here though and check the cabinet on the right for Handgun Ammo. It's probably a good idea to save at the typewriter here. Get on the contraption at the edge of the lava to be carried across; Ashley will remain safe here for the moment. You are taken to a new area.