Bruises without damage in grenadiers

@Shteevie @Teeceezy my guild mates and I have noticed getting bruised in this challenge when we were clear of grenadiers. We didn't know we were bruised until the summary screen. At first I thought we might have missed seeing an explosion from across a wall, but now it's happened enough times that I'm sure my survivor's are getting bruised without being hit.
Anybody else noticed this?
Anybody else noticed this?
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