How do get top part of sword in Lara Croft Legend?

first when you enter Arthur's tomb walk up to the glowing orb and it will trigger a cut scene, after the cut scene head left and look for a broken tomb it will trigger another cut scene then take the broken slab to a broken pillar on the right, then pull the chandaleir as far back as it will go
then go up onto the broken pillar and jump to the left onto a big block which will raise the bell and the chandaleir will strick it and shatter the tomb then another cutscene will happen where Lara takes the piece of Excalibur and aploigize to Arthur for taking it.