confident

Formation?

What formation?

Did the monster ever allow them to move and act according to a proper plan or formation?

It didn't.

The monster didn't care even the slightest about the other humans around it. 

The only one it saw was the light-brown-haired man standing behind the others. 

The only one it targeted was that person.

The only one the monster attacked was that dude. No one else. 

The team couldn't attack properly because of that fact. The only thing they could do was prevent the monster from getting closer to Kairen. 

What they could do was mostly defense. Block the monster, stop the monster from moving, and distance themselves from it.