a tightness formed in his chest , pulling concavely inwardand from all anglesshreds of pectoralis and latissimus dorsum fiber , clumps of pulmonary tissue , shards of splintered ribcage and vertebra , as well as slivers of shredded skin , until all depressed conically and on a parabolic trajectory toward an origin amid what he presumed to be his exact pinpoint center of gravity ( transformed now into a singularity with a gravitational field of unmatched intensity , the force of which was unrivaled by even the most formidable of black holes ) .