"There's something big underneath the swamp, be careful."
Just as Sherlock had summoned the Mud Hawk, he immediately started to warn his companions, "When I summoned the Mud Hawk, I felt a tremendous pressure coming from inside the swamp."
The original "feel" of summoning a Mud Hawk should be like pulling out several chunks from half-kneaded, loose dough. But Sherlock felt like that as he was pulling, the dough was squeezing his hand from all directions...
That usually meant that something very large was moving in the swamp, which was why pressure was being exerted there. Or it could be that there was some kind of barrier beneath the swamp.
Just in case, Sherlock decided to warn them about the most dangerous possibility first.
Soon enough, his warning became necessary—
The ground suddenly began to vibrate violently, causing Sherlock to stumble and nearly fall.
It was at that moment that a grey silk thread shot out from behind him and hung him up in a tree.
