Douglas dropped it.
The Titans aren't offering up just how much Oregon-style read option they will run with Mariota.
But from the start Ken Whisenhunt has said the team's intention is to blend things the rookie quarterback does well with the Whisenhunt's offense.
Sunday, Mariota was 10 of 16 to raise his practice numbers in 7-on-7 drills and full-team periods to 127 for 202.
Mariota threw an interception and lost a fumble Friday night in Atlanta but wound up 7 for 8 for 94 yards.
The best play of Sunday's practice might have been made by receiver Justin Hunter, who went up over safety Marqueston Huff and cornerback Cody Riggs to pull in a Mariota touchdown throw in the back of the end zone in a red-zone period.
Later there was a very nice four-pass sequence.
Mariota connected with three different receivers on passes of different depths into different areas of the field, capped by a beautiful mid-range throw to Kendall Wright between several defenders on the left hashmarks.