Right now, the Tampa Bay Rays bullpen is in a state of flux. Aside from closer Alex Colome, the Rays do not seem to have a reliever that manager Kevin Cash trusts in the later innings. While Danny Farquar could end up being that pitcher down the line, it is quite apparent that the Rays miss Brad Boxberger.
Given the state of flux in the Rays bullpen, it is understandable that manager Kevin Cash would be looking to find the right role for each pitcher. That, naturally, will lead to a bit of experimentation, which we have seen with Austin Pruitt.