nao tenho a certeza mas penso que fica assim :
We were looking (1) at when we saw one of the trapeze artists fall. We all screamed and waited (2) for him to crash to the ground, but he had an elastic rope around him and we all laughed (3) up our fear when we realised that he was safe. The performers came (4) from / to Russia and they were amazing. They all got (5) together when they were very young and trained for years to do the show. We talked (6) about the show for days afterwards.