Vale Dazaki was tying the wounded flesh together with the string, using partially chakra to focus to control it he replied; "I work fast as I can. But I do not know yet advanced healing jutsu to quicken your natural healing so I try patch the wound close so you at least do not bleed to death." Vale worked fast as he could, using the needle and string with practiced hand and he made final tigthening by using chakra and melding the two ends of the string together in the wound after tigthening it close. He cannot replace lost skin but most of damage is tearing sort, so he could use string and needle to reconnect the skin together. After the first operation he moved to next one. There was total five holes which punched through shoulder/chest he had to patch up and he have patched up two now.