In an animal way or a human way, he's gotten better at telling the difference what with Sasuke being a sneaky sneaker who relies on ambushing people half the time...

He also has spare chakra so doesn't really mind making a clone to check things out. Maybe they'll catch dinner! Or get bitten by a snake. Or get stabbed. (Sasuke's weird anti-kunai spell should catch anything thrown at them.)

More of an animal way.

When the clone goes over to investigate, it turns out that the leaves are more like teeth. The bush shakes angrily when the clone pops into smoke instead of bleeding delicious, delicious blood.

Okay then carnivorous plants!

They'll keep going, keeping a closer eye on not touching suspicious stuff, or at least sacrificing Naruto clones towards anything potentially dangerous.

A bank of fog slowly creeps in, deepening the natural gloom of the forest floor.

Oh that's not suspicious at all... Still, not much he can do except pay attention to his hearing.

Sugira isn't planning to use chakra for anything else so can flash sharingan at random intervals, at least...

A good time to be alert. This pays off for Chihiro as she's barely in time to stick a hand up to prevent a loop of ninja wire from closing completely around her throat. As she starts to focus wind chakra to cut herself loose, two figures wearing breath masks fade out of the fog to attack Naruto and Sugira.

He'll start with just sword-work, no spells or chakra, aiming to disable but hopefully not kill, at least not immediately. Mostly going for upper limbs - easier to survive without those.

Naruto has no particular worries about wasting chakra on channeling wind into his kukri and slashing at his opponent. He's not really trying to be deadly, but not being cautious like Sasuke is.

Their strikes pass through the figures as easily as through the mist, and with no more apparent effect.

Chihiro gets herself free and draws her blade.

Illusions.

His sharingan is active, as he looks for the real origin.

Naruto holds off on spamming shadow clones until Sasuke can get a look.

They're not illusions. Or not entirely. The bodies are made of the mist around them, given form and color by a small amount of chakra.

More of them rise up around the team, but there's one on the far side of Naruto that's real.

"Don't let them hit you," Sugira says.

Then a gesture to Naruto, causing a horde of clones, a cantrip to whisper the location, and glitterdust would be useful here but Sugira is saving spells -

Unless their opponent is faster than Sugira, he's getting stabbed.

He gets stabbed.

Chihiro puts wind chakra into her sword and releases it in a spinning slash, causing a gust that blows clear a segment of fog and clones.

And knock out the downed one, then start searching for one of the real ones -

Chihiro begins charging up another blast in a different direction.

A hand shoots out of the dirt to grab Sugira's ankle, and starts pulling him down.

He sheathes his sword in lightning and stabs down.

There's a muffled scream like someone has a mouth full of dirt and just got stabbed in the shoulder.

One of the Narutos might catch a flash of movement from behind a tree that Chihiro's second blast hits.

He goes after it.

It's one of the genin from Amegakure. She throws a small weight attached to a length of wire backward over her shoulder and gives it a little flick to cause it to loop around at neck height.

Unfortunately for her only clones are caught, and there's now Naruto clones descending from the canopy with kukri drawn, with several others appearing in front of her.

She spits a series of water bullets, but a straight fight is clearly not what she's good at.

Then Naruto's probably gonna get her pinned and then knocked out without ridiculous measures.

When she goes down, the fog clears out.