Skipped a bit, but next time you see mages, Focus Target them.
If they are raised, you will know, and can try to kill them before they heal up.
If you kill Mage A. Mage B can use swift cast. If you then go after Mage B, Mage A can swift cast.
OR
Start with Mage A. When Mage A is back up, go after Mage A again, rather than Mage B.
Mage A has no MP, no TP, and low HP, and Mage B cant swift cast for 60 seconds.
