Hearing the beast behind him, Iṃgor jumps forwards, both out of surprise and to get out of its range to identify it; his instincts made sure he'd have enough torque to turn around midair.
Landing in a stance for aiming and firing a bow, he immedeatly switches back to his trusty bow, lining up a shot.
Before firing, he makes sure if the creature is affected by the plague, by tracing every lifeform infected by the plague within 100 meters, he cannot afford to be surprised like this again. Since he does not expect to need magic for anything else in the near future, he keeps the spell active. He shoots.