... after doing 'Investigate the Beach' near Silvanus' Grove I tried to do a quick rest before actually talking to the tiefling child at the beach - because I had had the encounter previously without all my spells available - and when I came back I found that the quest had gone about its way and the harpies had killed the boy before I could intervene. The world will progress if you take a rest, basically.
Really? that's awesome. I was hoping that rest will have an impact (such as time passage). I'll try that as well, just to make sure it wasn't a bug on your end.
