"...five minutes," she decides. "We'll stay here five minutes then leave and review."

She starts moving her hands and fingers and tendrils thinner than hair of a hard-to-see material are conjured from her fingers and stretch out towards the creatures.

They're not expecting invisible strands of hair that can cut their tentacles off and do not react well to their existence. When they notice they're under attack they shriek which alerts others and causes them to start converging.

"...I see what goes wrong."

"...does this do anything?"

"—very little and it goes badly but—also well?"

"They're damaged by purely-material things. We should get Lee Tae-gun here."

"...we can do that?"

One of the jellyfish slams its whole body against the barrier.

He cries out and falls to his knees.

"He's in a dungeon, too, but it should be quick, and he can handle this."

"How do you—"

"We're partnered, now."

"Oh shit. Yes, get your partner here if you can." She's not even going to feel insulted, clearly this is above her paygrade and besides if Lee Tae-gun shows up that means they won't need a whole team of support.

He can handle five minutes, sure. It will, as predicted, suck, but he can.

And she can get a good read of the place in those five minutes, and work on a better model of the environment on her commscreen while she does that.

When they finally step out they're all various types of bedraggled and fucked up, except Jaeha, who looks fine. He immediately gets his commscreen out and sends a message to Tae-gun.

And the team leader sends an official support request. 

"You said he was currently in a dungeon?"

"Yes, but it's B-rank, he shouldn't take longer than an hour or two."

Well that's going to make this dungeon overrun the planned time but none of them have any other dungeons planned for the day and it's not like psychic dungeons have the least amount of variance in how long they take to clear. But what it does mean is that they need to stay on high alert until Lee Tae-gun shows up (she's not fangirling you're fangirling shut up).

"Since we won't be going into the dungeon until our backup shows up, we should take this time to locate other monsters. Their alerting of each other means we can't properly take them out but knowing where they are will be useful.

"Kang Jaeha-shi, shield the support staff so that they can call in if any more monsters leave the dungeon?"

"Yes, team leader-nim."

Won Seonwoo will stay behind because those ten minutes of having his barriers hammered against were hell on his backlash so Kang Jaeha doesn't need to do that actually.

Very well. Out they go, then.

The monsters aren't totally incorporeal but they're not totally corporeal either. Since they can go into buildings it would not be feasible to check everywhere they could be directly but they remain in contact with Won Seonwoo and he can use his power to point them in the right direction.

And a little bit over an hour later Lee Tae-gun appears back at the main camp.

"Good evening."

They've done as much recon as they're going to so they're all back, too.

"Good evening, Lee Tae-gun-nim. I am team leader Choi Hyun-min, B-rank combat esper, and these are Won Seonwoo, B-rank psychic and defensive esper, and Goh Su-ah, B-rank sensor esper."