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Just have everyone charge up their ult meter, and then use them all at once.

The Chinese version (势不可挡), is an idiom pronounced as shì bù kě dǎng, which means unstoppable momentum or an overwhelming force that cannot be resisted. It apparently comes from "The Biography of Xi Jian" in the "Book of Jin," stating: “群逆纵逸，其势不可当，可以算屈，难以力竞。” This roughly translates to: "The rebellious group was rampant, their momentum unstoppable. It can be considered a defeat, but it is difficult to compete with." No enemy can stop you from using all your ultimates in a row.