Tyra's burn monster talent does roughly 11.7% damage every .6 seconds. When Raum has his complete soul armor, that's 8k health. Tyra with burn monster does about 936 damage every .6 seconds, and that's not including weapon shots. Enough said.
Set out Luna, and mark Maeve so Luna can rush and stun her. Even with the stun gone, keep her marked because Luna can still deal auto-aim attacks to Maeve. Though once your fox is dead, run away. LUNA counters Maeve, not you.