I have these thoughts. Playing time with an injury is harder than scoring a penalty with an injury. Did he have some sort of minor injury during the game? Maybe pulled a tendon? I know that injury may not be felt under pressure. But there's always a little break before a penalty shootout, right? And during that break the injury (even a minor one) could have made itself felt, and that's why he was taken off the penalty shootout.
Question: was there an injury at all?