Jackson quickly opens the door. "Sir Glassstaff, if you please."
Jackson scurries his way in, bows, and holds his arm out invitingly for the "Glassstaff" to present himself.
(Didn't catch Nil's post before my post! Gonna add something, if I can.)
Shortly seeing Nil about to cast a spell, Jackson will use the hand he's holding out toward the room to cast Bane at first level, targeting the wolf, the bugbear and the drow. "I now present the Glassstaff, himself."
Expecting Harukai to follow in after him, Jackson waits for a moment, only to be surprised by Sildar barging into the room to fire off a spell at the bugbear. "TYR'S BEARD!"
Movement -- Reacting to Sildar's sudden and unexpected act of aggression, Jackson immediately drops his hood and rushes over to kneel beside Gundren, saying, "Open your eyes to the light, my friend, for we are here to save you."
Action -- Jackson then holds his right hand over Gundren and his left hand toward his allies, casting Aid at second level on Gundren, Harukai and Nil to give them +5 to both their current HP and max HP.
Bonus Action -- Jackson then casts Healing Word at first level on Gundren to bolster his dwarven ally: 6
Jackson then turns toward the battle, but remains in the same space to act as a protective shield over Gundren while the dwarf gets his bearings.