Severance fans have a terrifying theory about Helly in season 2 - here are all the clues
One crucial clue is that, of course, Helly lies to her colleagues about what she saw in the outside world - something that Irving (John Turturro) is immediately suspicious of. She says she saw a gardener (working at night), and that she told him everything about Lumon, apologising to her colleagues that she didn't do more.