It took a long time for the disciples to begin to understand what Jesus had told them. He had said that the Son of Man is going up to Jerusalem, be handed over to his enemy, be tortured, executed, but then rise from the dead, "I will be lifted up." But they never, never really understood what he meant. So when this happens, they were just clueless. They might have thought (and maybe some of us think this way) that Jesus was talking about what we would call a resuscitation.