OK, I can see where Liement could be bad, like in your example above, but as it is now, it's brilliant for example on Arch Ultima when it does Citadel Buster. From previous experience (before update) CB did ~500 damage to all party members with once for all or with Valiance active, so Liement is still better.

CB has a 30 sec countdown, which is even enough time to get 3 runes up, if you either just got dispelled, or if you had used Lunge, or just had 3 of a different element up, and still hit Liement.