As Riya poured her healing magic into Jin's near-dead body, she used an artifact from her space ring to send back a signal to Link.
Before the two of them separated, she had given Link a message-receiver-type artifact that would convey her message.
This way, if Riya and Lia find that the source of the soul manipulation skills is too strong for them, they can send back a message to Link and Rio to ask them to come over for help.
'It will take them a while to arrive here, even at the latest… Moreover, it's highly likely that either Link or Rio, only one of them, will come; after all, they still have to keep all the monsters above at bay…'
Defeating Alverto alone would already be a very daunting task; if all those monsters rushed here and started to help him, they would have no chance at victory.
They will all end up dead here if something like that happens.
"I will go challenge him next…"
