She doesn't.

"No- I won't. Just let us go."
"Big mistake. Caw!"

He goes off just out of earshot and talks to his fellow Cultists via a mic in their masks.

'Time to string the ladies up nice,' he says.
'I'll get the redhead ready in Sector 2. Bring blondie over in about...10 minutes or so.'
'Copy that.'

Time passes poorly for all 3 ladies as Iona is tied up really scarily.
She's hanging upside down from a strong tree branch- more secure than she can tell- and tied really tight.

She can't do anything to escape and, in this position, can't see much at a time....

Cheri is also helpless, but slightly better off.

She was untied from her spot on the ground but led away in a matching manner to her friends earlier with the long stick, gag and ropes.

She's led to where her hanging friend is and is in shock.
Mind you, she can't express it well through the gag.

The Cultist toys with them for a bit, shoving Cheri's tits right into her friend's face, as well as rubbing other parts of her body up against Iona.

To build up tension and tease them all the more, he plants the back end of the stick into the ground.

With the long heavy end planted, she can't move and just watches him toy with Iona for a moment ...

He has his fun and leans in close to Cheri.

"You had a chance. This is on you."

Out in the distance, the trio hear an anguished cry.