No, but they can set combustible material alight in the midst of a rampage. There is enough of it within this mall to be believable.

[But he shrugs. He'll get out of this mall one way or the other, and Sai is somewhat naturally submissive, due to his training with Root.]

In the meantime, it will be best to prevent the infected within this building from escaping with us, by whatever means we ultimately use.