Diēscogitō slowly digested what the child told them, but before he could think on it further, and before they could even plan a sensible course of action, the fool child swung the door open. That started a chain of events to spiral far beyond anyone's control. One of them rushed into the circular chamber, as did another in fast response. He thought that move rather reckless, but the other room arguably had more room to maneuver. 

Still the creature was momentarily distracted as people started running past it. Diēscogitō soon realized, as any sensible person would, that he and his new 'companions' did not have a chance in the nine hells in killing the creature before them. Still they need not kill it to effectively immobilize it. When the creature turned its attention to the other running figures, Diēscogitō had already started chanting the incantation to a spell he hoped would do the trick. He skidded to a crouch several feet behind the giant, outside its considerable reach. He would need time to weave the spell so that instead of covering a wide radius across, it would instead penetrate deeper into the ground than normal. If he could just get it to 10 feet...

He circled his hands in the air as if writing something then slapped his hand to the ground. A glyph gleamed an emerald green for several seconds before fading again. He had set it to the creature’s weight as to avoid one of his allies activating it. 

"Lure the thing over here! And quickly!" He hoped they heard him over the din of battle. If nothing else the giant might give up on harassing the orc and small child and charge this way. If so Diēscogitō was ready to spring away, but he would need to time it just so.