Looking briefly at Merek, Flynn says, "I too hope this mushroom is here - that noise would have woken the dead if we weren't already destroying them..." as he darts into the room and searches it.
Spoiler: Searching the room[roll0]
Depending upon how much time Taking 20 would require, Flynn would be willing to spend about a minute or two looking carefully if nothing decides to surprise us from behind. If he does so, it would be a "27" result.