Mutt sees the goblins, wolf and the bugbear in the room, and decides to take a stealthy approach. He starts helping the other party members climb up the fissure, with the aid of his webbing. While the climb itself wasn't difficult, it is unfortunately rather difficult to be silent in with such a group.
The goblins start hearing noises from the corner. The bugbear turns towards the western part of the room where the party is hiding. He first shouts something angrily in goblin, then takes a second look at the intruders. "What? Who are you? How dare you try sneak up on the mighty Klarg! Lay down your weapons and surrender right now, or face the wrath of the Cragmaw clan!"
The bugbear draws a mean looking morningstar and takes a couple steps forward. One goblin draws its sword while the other takes a step back and nocks an arrow, aiming it towards the party. The wolf is pacing in font of the bugbear, growling and snapping at the intruders.
Spoiler: Description of the room, what Mutt saw earlier
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Mutt arrives in another room. In front of him there are two stalagmites, which seem to be good for hiding behind. In the room Mutt sees a wolf lying on the ground and a mean looking bugbear shouting at two goblins who are looking down, seeming both annoyed and afraid. The bugbear is speaking goblin, so Mutt can't understand what he's saying, though the bugbear does repeat the word 'Klarg' several times and thump his chest.
At the south corner of the room there also seem to be some crates. In the middle of the room there's also a fire pit, with two rabbits roasting over it.
Spoiler: OOC
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You can move your spots on the map max 10 feet if you want (I just placed them randomly).
The stalagmites provide 1/2 cover to creatures hiding behind them (+2 to AC).
The fire pit lights the room well enough no one needs a torch or darkvision to see.
Spoiler: Initiative order if the fight starts
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Goblin 2
Mutt
Martin
Sariel
Ripper
Klarg
Nalan
Goblin 1
Map