A red bar with word 'Refugees' appears at top of screen, and you need to escort them back to Sapran. Refugees will be going along a set route, and you should run ahead of them to clear the area of monsters, particularly of those nasty Garudas and Amigos. Do not wander too far ahead or the monsters you slew will respawn near the refugees and start taking them out.
Once you reach a checkpoint slightly to the W of SPN near the dunes' lake, and if none of the villagers perished, you get SITUATION BONUS [Delivered all the unblesseds safely.] for whopping 7500 EXP. Achievement <GUARDIAN> is also yours for valiant efforts.
There'll be a scene near the lake - one of the refugees has gone missing. Who was the last person that saw the little boy? Talk to 'Servile man' twice so that he says 'A kid? Yeah, I saw one. He was heading south.', and then talk 'Disheartened woman' twice so that she says 'I saw a kid wander off towards some rocks. I hope he's okay.'. Now go talk to Faina - Rico and Rucha leave the party momentarily. Go save your game, then head towards Sapran. As soon as you pass rocky arch, a scene shows Leif being attacked by a bear. Save Leif by slaying the bear.
It won't be quite easy though - a couple of snakes mix up the heat by attacking Leif as well. Ignore the bear and pass it to take out the snakes, then knock out the bear. This is first half of saving procedure... now Garuda will come and attempt to take Leif away. Do not move! Aya Connect and use Ravaging Raptor to aim at Garuda. Shoot it down before the red bar depletes or it's Game Over.
If you manage to save Leif without him getting hurt, you'll get SITUATION BONUS [Resced Leif without him getting hit.] with a reward of PANACEA & MIRACULOUS MEDICINE, as well as an achievement <FOR THE CHILDREN>.