What was the ref doing? GGG Vs Stevens?

but as they pointed out,,, its illegal if its open gloved, but legal if you are making a fist,, not sure whether ggg was open or closed glove,,

For holding his arm out, and measuring. Its used for a few reasons, to gauge distance as well as blind the other guy to a str8 right the comes behind it

Like I said, why did the ref warn Gena? For what? He kept warning him for sticking the jab out and keeping it there. Seemed a little overly-interested in that.