The moment captured what theater lovers know but audiences don't always see: understudies and swings must be ready at a moment's notice.

Brown wowed audience members after stepping into the role of Eva Perón midway through a performance of "Evita" in London's West End on July 24.

Rachel Zegler had to leave her ‘Evita’ performance mid-show due to falling ill on July 24. Thankfully, her understudy, Bella Brown, stepped in.