Tank the boss near dwarf NPCs. when she stuns you she *should* turn to dwarves and start attacking them instead. Also Xuen, Headless Horseman pumpkins, Mogu warrior trinkiet, brewmaster statue with taunt (like 2nd head in reliquary pre nerf) etc. should work that way. I was doing it this way at 85 with my DK. On 4 stacks pop army. On next 4 pop ghoul etc..
Though.. Razorscale is the most boring fight in the entire Ulduar and takes forever to kill..