As Shrapnel sped off, a trail of yellow light streaking behind him, he allowed his form to degenerate back into a random clump of metal, as holding his humanoid form drained his power. He wasn't streaking off for long, he soon disappeared into a wormhole, manipulating it in order to have it take him to the Antimatter universe, specifically Qward, the home of Sinestro Corps, and the closest thing Shrapnel had to a home.
It wasn't long before Sinestro had been warned, and Shrapnel had his orders. Sinestro had been overcome by a pale face, and it was a moment before he could speak. His tone was grim, and Shrapnel knew that it was truly a serious threat. Shrapnel's order had been to go, group up with the other Lanterns that he had met before, and follow their advice, and call the Corps for assistance only when he was positive that the Manhunters were there, and a viable threat.
Sinestro knew that it wouldn't be a good idea to offer advice to the other Corps. Thanks to his recent involvement with the Manhunters, distrust would spawn, and that was not what they needed, not in such dire consequences. No amount of Shrapnel's arguing helped- he was on his own, for now. 
So Shrapnel left, about to take off, to find the other Lanterns, before he was stopped by a warning. "Ring Battery at 2%." Shrapnel chuckled to himself, glad to have gotten this warning now, rather than in the middle of a fight. He shifted aside the plate of metal that guarded his power battery, then removed his power ring. As he chanted the Sinestro Corps oath, his body reformed, snapping together with a satisfying clang punctuating each sentence.
[i]"In blackest day, in brightest night,
 Beware your fears made into light
 Let those who try to stop what's right,
 Burn like his power...
 SINESTRO'S MIGHT!"[/i]
At the end of the oath, Shrapnel's body had fully formed. He then took off, yellow energy trailing behind him, a crater left in the ground where he was. Spinning through the air, Shrapnel suddenly dissipated in a burst of Yellow light, utilizing a wormhole in order to return to the charred planet. Upon arrival, he looked around, before realizing that they had not spoke of where they would meet. He set his ring to send a signal, telling the Red and Blue Lantern to meet back at the charred planet, with his coordinates.