Well, this is what I found:
http://www.wowhead.com/npc=29626 spawns at X: 6447.573 Y: -1728.755 Z: 480.7186 Orientation: 5.66264
his waypoints are
X: 6450.068 Y: -1730.539 Z: 481.0719
X: 6454.975 Y: -1734.046 Z: 481.8981
X: 6459.588 Y: -1737.343 Z: 484.043
X: 6461.15 Y: -1738.459 Z: 484.4799
http://www.wowhead.com/npc=29626 casts http://www.wowhead.com/spell=55486 on the player when he dies
the falling rocks are
(@OGUID+389, 191794, 571, 1, 1, 6447.813, -1755.094, 456.6544, 0.05235888, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+390, 191794, 571, 1, 1, 6481.777, -1752.007, 458.7755, 0.1396245, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+391, 191794, 571, 1, 1, 6467.791, -1748.995, 511.3322, 0, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+392, 191794, 571, 1, 1, 6491.699, -1745.516, 542.3831, 0.4537851, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+393, 191794, 571, 1, 1, 6520.108, -1734.326, 461.0402, 4.171338, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+394, 191794, 571, 1, 1, 6421.026, -1716.979, 500.0077, 5.829401, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+395, 191794, 571, 1, 1, 6529.01, -1723.248, 457.2287, 1.274088, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+396, 191794, 571, 1, 1, 6440.159, -1688.635, 453.0173, 5.253442, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+397, 191794, 571, 1, 1, 6451.857, -1721.448, 457.9259, 5.113817, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+398, 191794, 571, 1, 1, 6525.827, -1670.884, 481.5853, 1.710422, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+399, 191794, 571, 1, 1, 6449.62, -1726.283, 508.1216, 5.532695, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+400, 191794, 571, 1, 1, 6479.444, -1707.681, 521.955, 2.373644, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+401, 191794, 571, 1, 1, 6501.444, -1691.474, 520.4632, 3.194002, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+402, 191794, 571, 1, 1, 6438.672, -1691.771, 496, 4.450591, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+403, 191794, 571, 1, 1, 6452.118, -1674.29, 459.9882, 4.939284, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+404, 191794, 571, 1, 1, 6427.761, -1708.688, 460.3108, 5.951575, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+405, 191794, 571, 1, 1, 6550.207, -1673.569, 472.539, 2.635444, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+406, 191794, 571, 1, 1, 6462.897, -1652.708, 483.0869, 3.804818, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+407, 191794, 571, 1, 1, 6501.737, -1642.168, 481.7906, 3.455756, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+408, 191794, 571, 1, 1, 6417.866, -1645.066, 464.6994, 0.2443456, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+409, 191794, 571, 1, 1, 6489.943, -1626.269, 452.8661, 4.118979, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+410, 191794, 571, 1, 1, 6487.299, -1645.281, 453.6305, 3.560473, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+411, 191794, 571, 1, 1, 6439.751, -1622.467, 450.6702, 5.846854, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+412, 191794, 571, 1, 1, 6529.01, -1723.248, 457.2287, 1.274088, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+413, 191794, 571, 1, 1, 6421.026, -1716.979, 500.0077, 5.829401, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+414, 191794, 571, 1, 1, 6501.737, -1642.168, 481.7906, 3.455756, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+415, 191794, 571, 1, 1, 6397.639, -1619.929, 454.296, 5.829401, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+416, 191794, 571, 1, 1, 6373.41, -1612.911, 446.194, 5.916668, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+417, 191794, 571, 1, 1, 6381.69, -1637.165, 439.9731, 0, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+418, 191794, 571, 1, 1, 6440.159, -1688.635, 453.0173, 5.253442, 0, 0, 0, 1, 120, 255, 1),
(@OGUID+419, 191794, 571, 1, 1, 6451.857, -1721.448, 457.9259, 5.113817, 0, 0, 0, 1, 120, 255, 1);
these become visual only when under the effect of the debuff aura
there are some http://www.wowhead.com/npc=29999 that cast http://www.wowhead.com/spell=59383 when http://www.wowhead.com/npc=29626 dies
and somewhere near the entrance of the cave there is an http://www.wowhead.com/npc=29999 that casts http://www.wowhead.com/spell=55693 which removes the debuff aura