Pruth didn't stop Shiro from leaving. Instead of walking back on the same path in which he had entered, he asked the Clown Master to teleport him just like he did with Lisa.
The clown master with Pruth's permission did exactly that and by the time Shiro blinked twice, he was already out of the dungeon.
He found himself in the room in which the door leading to the dungeon was present. Before he could comment or think anything, Lisa jumped forward and hugged Shiro tightly.
"Shiro!"
Shiro was about to dodge when she jumped forward, but he realized the familiar presence. Hence, he stood at the same place as she hugged him.
"Haha, Lisa…", he smiled as she stopped hugging and walking in front of him.
Without a second's hesitation, both of them hugged each other yet again because they knew how much of a dangerous moment passed.