How much will Vikings play J.J. McCarthy in the preseason?

Ben Goessling, Andrew Krammer and Emily Leiker discuss the latest from Vikings training camp. QB J.J. McCarthy returns to the field in Saturday's preseason opener vs. the Texans. How much will he play? Who will play alongside him? What, exactly, caused a recent pause at practice when Kevin O'Connell had to intervene? And which players made Ben's initial 53-man roster projection?