After watching the cut scene you'll have about 45 seconds to get from the switch to the relic.
Save your game manually, if you don't make it, you can reload at the checkpoint, pull the switch and try again.
As soon as the cut scene ends, drop into the water and swim around the right side of the tower and back toward the steps.
Keep jumping from pillar to pillar to grab the pillar with the lion heads, traverse left and climb to the top.
Jump to the circular ledge below and run to the left where you will find RELIC 1; the GRIFFIN HEAD PROTOME.
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