Avoid shortcut pulls
Gnomeregan is long, vertical, and full of patrols that chain. A skip can pull from behind or land the group in a pack it would have cleared safely. Take the established route while the group still knows the way back.
What needs an answer
Kill alarm bots first. They call nearby packs and expand a normal pull.
Fall damage and drop shortcuts. Clear the path instead of landing in packs to save a hallway.
Dark Iron agents stun and burst. Focus them before the mixed pack becomes a healer problem.
Electrocutioner 6000 chains lightning through the group. Spread before the pull.
Drink like the instance is long
Drink after every other pull. Mana discipline through the first two thirds sets the pace for the last third. A tired group should leave before the final route becomes rushed.
Alarm bots decide the pull
Kill alarm bots before fighting nearby packs. They can turn the next pull into a chain.