Just got back from the Arkansas v Virginia regional final. There were no less than a half dozen square and bunt attempts. Corners crept to about 75 feet away (maybe 3 steps onto the grass) and froze until the pitch was delivered.
Cal Ripken doesn't mention creep and freeze. He wants them in motion--a "controlled charge". Here's a screenshot from his "Get Great" segment on mlb.com
The first baseman is in motion, almost even with the mound--way more than 3 steps onto the grass--just at the instant of bunt contact (R2 is still frozen in his secondary lead.)