Who was injured during a call?
On Chicago Fire Season 8 Episode 20, one of 51's own was at death's door after an attack.
Severid was determined to find out the truth, leading to another explosive development.
Meanwhile, Foster contemplated a big decision that could take her out of town for a long time.
Elsewhere, Kidd was concerned for one of her high school trainees.
What was going on?
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.