Assuming both murders were perpetuated by the same person and that both victims were awake at the time, it might be just that. That, or perhaps regardless of the killer's strength, children are easier to... [ugh] drag out of their room and maim. But constructing a list of who would fit the former criteria might be a good start.

[The staff needs to start picking acceptable targets instead of this shit. That said—]

... By the way, are you alright?

[With the sneezing and glass shattering, man.]