Just a few days into production on Glee‘s Finn Hudson tribute, co-star Kevin McHale describes an “extremely emotional” shoot that, at times, has been “hard to get through.”

Acknowledging that there’s essentially “no ‘right’ way to do it,” the McKinley vet says he was blown away when he first read the script for the episode, which is slated to air on Oct. 10.

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“There are so many incredibly well written and powerful scenes,” he shares, before singling out one sequence as being particularly moving. “When [the cast] got the script, we were all reading it together and we were like, ‘Did you get to that one scene.’ And when you see it everyone will know what that one scene is.”

McHale says reactions to Finn’s death will be both varied and surprising, noting that some castmembers “are having to play reactions that they obviously would not feel in real-life, and that’s a weird thing to play. Because you want people to know how you actually feel. But [Ryan Murphy & Co. are staying true to] the characters, and that’s the smart thing to do.”

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For example. several characters find themselves in a deep state of denial. “Some people aren’t dealing with the loss of Finn, and it’s a difficult thing because in real life none of us were like that,” he explains. “We were all very much dealing with it.”