Indeed, it was Krishna that rescued Pritha's son from that death dealing Sakti otherwise that weapon would have quickly consumed the son of Kunti like the bolt of Heaven destroying a tree.
स विशेषात् त्वमोघायाः कृष्णोऽरक्षत पाण्डवम्। हन्यात् क्षिप्रं हि कौन्तेयं शक्तिर्वृक्षमिवाशनिः॥