Short answer is yes.
In 6v6 double slayer setup gets defeated by Teinhala's group (can be found on YT), which have access to 2 shatter enchantment (BG and dps DoK) on a 5s CD.
Slayers buff called rampage is an enchantment with 30s CD.
By tracking Rampage on buffhead (addon) you know when it's time to start shattering enchantments buff on the slayer.
Which is easy since in a double slayer setup its usually kotbs, IB, RP, WP and all their buffs are blessings afaik.
So the only one with enchantment buffs are the slayers themselfs, unless they use an AM healer. They could potentially use self buffs to dig the rampage buff deep inside ( the rule for removing buffs and debuffs is ''first in, first out'' ) but those buffs are on 60s cooldowns.
Point is that it have a counter.
As for WB v WB. I mean Bellow and challenge pretty much does the job. You can put damage pressure on the slayer to force them to drop their rage.
Proper singeltarget punts work aswell, maybe not that viable in wb v wb but it's there if you want to temporary remove pressure.
Notable is that marauder can kinda face-tank that damage thanks to the monstrosity proc.
Have to be mentioned aswell that Choppas is a good class, 25% crit damage tactic, 20s 35% increased autoattack speed for the party. Chop fasta! that negates slayers shatter limbs.
