With one out, Nick Ahmed fouled a Stephen Strasburg pitch past catcher Wilson Ramos, and it struck Danley in the mask, knocking him backward and stumbling toward the backstop at Chase Field.
Danley remained on his feet, and Crenshaw tended to the umpire while second-base ump Gabe Morales dashed into the umpire's locker room to don the gear necessary to take over behind the plate.
Danley walked off the field under his own power, with Crenshaw by his side.
Play resumed after a delay of about 10 minutes, with three umpires on the field. Morales was behind home plate, with Joe West and Rob Drake covering the bases.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.