He (simply) made them carless and destitute of energy, but did not deprive them of their lives. Bhimasena vowed to slay your sons.
विरथान् विह्वलांश्चक्रे न तु प्राणैर्व्ययोजयत्। भीमसेनेन तु वधः पुत्राणां ते प्रतिश्रुतः॥