Magnussen's team radio conversation indicated that the Haas team would have little in the way of defence, given how clear the discussion was.
Early on the formation lap the Dane said: "We've done the wrong thing, there's already a dry line."
His engineer replied: "Understood Kevin, what do you want to do? [Pause] So we'll do the start, and then we'll figure it out."
Near the end of the lap the engineer said: "OK Kevin, I think we'll box now, box now," to which Magnussen replied, "Yeah I agree, box now, box now. For dry, yeah? Box now for dry."
Grosjean's transgression appeared to be less blatant, but still illegal. On the formation lap he reported: "The track is drying a lot already... it's almost tempting to box and put slicks."
Just before the pit entry, his engineer said: "Box, Romain, box," before repeating it, and adding a message about adjusting a setting on the steering wheel tyre setting.