From MC's perspective:
Hidden Tunnel:
Everyone's expressions change drastically. They can't move their body. So they don't know what kind of terrifying monster is looking at them from above.
The Giant centipede-type monster noticed there was no further movement in the tunnel.
Its cunning eyes flickered like a human intellect. The monster then opened its mouth. It started to suck their bodies into its stomach.
"Swoosh"
The next moment, the vortex was formed.
"Pfff"
One after another the level-6 wizards turned to blood mist. Their whole body parts were sucked by the vortex and then went to the monster's mouth.
Until the last moment, the level-6 wizards had terrified expression. Before they could see the monster they died under the vortex pressure.
When the level-6 wizards are gone. Only their leader level-7 wizard is remaining. Unlike them, he managed to connect the dots.