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When walked over you gain a powerful whirlwind chucking buff, Drunken Master, that stuns any and all dark iron dwarves you go through. They become sitting ducks that other players can then pick off, one by one.
If you don't want to get drunk but still wish to help out defenders, you can ride over the Super Brew Steins while mounted! Players will not be dismounted when they do. Using a mount with a 'tall footprint' such as as gnome Mechanostrider mounts, or troll Raptor mounts and blood elf Hawkstrider mounts should allow you to view the red trail easier. You will gain the Drunken Master buff while being able to speed around on a mount. Being mounted will also let you get to the Steins much faster, and allow other players to focus on defense.
You may or may not see the mount 'slide' instead of running while buffed; this is perhaps because the event designers might not have intended for the Steins to be used while mounted.