If you haven't already made the GUARDIAN break the third eye symbol, you can do this fairly easily from above. Go around to the southeast corner of the walkway...

...and jump on top of the pillar with the symbol.

Dangle Lara from the edge of the pillar above the symbol and wait for the GUARDIAN to approach. Traverse around the corner to whichever side is nearest the bull.

Then traverse back to the side with the symbol.

The bull should then charge and smash it.

If this tactic doesn't work for you, drop down, lure the bull away from the symbol, and then lure him back to it just as you did with the others.

When the third symbol breaks, a door opens on the opposite side of the room, just to the left of the first eye symbol. Drop down, roll...

...and run/sprint through that door.

Continue forward, then right...

...to the end of the hallway. Climb the ladder...

...to end the level.

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