He leads the rest of the group out of the narrow passage and into the open chamber.
"Let's press on, eh?"
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Investigation (in case you want to call for it) - (1d20+5)
(11) + 5 = 16
Perception - (1d20+5)
(5) + 5 = 10
Attack roll possibly at disadvantage vs. unseen target, damage - (1d20+7, 1d20+7, 1d10)
1d20+7 : (2) + 7 = 9
1d20+7 : (15) + 7 = 22
1d10 : (10) = 10