With the Boromar goons running away, the adventurers are able to climb  into the Professor's skiff without issue.  Right before take off, the  group is joined by Amarande and his fey beast companion.  Based on  River's instinct, instead of returning to Morgrave University, the group  returns instead to the Tavern Shard.
Brews moves the group  immediately to the upstairs large bedroom.  Brews always jokingly  referred to the room as King Galifar's room.  Now, with several members  of the guardsman in the room, it would not surprise anyone if royalty  was in place.  Of course, the ancient healer Shageon is at the center of  the room caring for the poisoned guard, now lying on a bed.  
River moves toward Shageon and shows him the chimera claw.
"Wonderful!" exclaims the elder halfling, "The  professor sent many necessary ingredients over after you visited him.   This is the last thing that I needed to perform the poison specific  delay."
Under the watchful and curious eyes of the guard  and adventurers, Master Shageon performs some skilled alchemy and a  healing ritual that culminates in pouring a light blue tinged elixir  into the unconscious guards mouth.  Nothing happens at first.  Over the  next several minutes, the guardsman starts to stir.  Eventually he lifts  his head from the bed and looks about the room.  He looks at his  comrades for half a moment before realizing what errand he was on, "Brothers! There is going to be an assassination attempt!  We must hurry!"
The  guardsmen quickly reassure him and inform him and the adventurers that  there was, indeed, an attempt to assassinate several ambassadors  yesterday.  The attempt was foiled by some brave patrons of this very  bar, who in turn, are helping the ambassadors find and defeat the  assassins.
Shageon brings the adventurers together for a quick meeting, "I  can't thank you enough for your efforts here today.  With the poison  suppressed, this man's life will be saved until we can further research  and cure his poison.  I fear that we may have saved one man but  uncovered some deeper conspiracies.  Please don't venture far from  Sharn, we may need your help in the future brave warriors."