I guess you missed the part where Cruz attacked that story and it's unidentified sources..before Trump launched his attacks. Trumps attack strategy employed here is the same as the leftist media and establishment repubs have used against cruz. That's just a fact, not conjecture. No knee jerking required.
I heard right here, that there was also a recording of Cruz going negative.
Did that not happen?
Here’s an audio of what Cruz actually said. Pretty mild and to a private audience. The msm of course blew it up and The Donald overreacted.
http://graphics8.nytimes.com/packages/audio/politics/20151210cruz/Cruz1209.mp3
Doesn’t matter.