Guild Wars 2

So Im a Sylvari ranger in 16 doing the “Source of the Issue” personal story quest. Problem is that after I go to the river and defeat the 5 Nightmare Courtiers I get a new objective to follow the river, but Malyck stops following me. Its very annoying as it prevents me from finishing the quest. I would love if someone would respond ASAP.

From http://wiki.guildwars2.com/wiki/Source_of_the_Issue

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After defeating the first group of nightmare courtiers near the river, the green mark on your map will change location, but if you just turn back and head there nothing will happen and the quest will not progress. Instead of walking, you have to swim into the river towards the marker (you will not be able to reach the marker, whilst swimming). Eventually, the marker will change to its proper location and you will be able to continue the quest.
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This maybe??

Ahh maybe yes! Thank you for your response. I did try to swim down the river, but I guess I didnt go far enough. It gets harder when you only have one companion with you.
Again, thank you for your response it helps out a lot.