Sarah and Casey have been captured and Marco (Dolph Lundgren) leans into Casey and says "I must break you."
That line is an allusion to Captain Ivan Drago's (also played by Lundgren) "promise" to Rock Balboa in Rocky IV.
Chuck, Morgan, Sarah and Casey are in the server room when Marco says on the radio "If you die, you die", which is an allusion to the Drago's statement "If he dies, he dies" in Rocky IV.