Textbook, too.
I will also point out, again, about Gurley's position at the time Goff commits to making the throw. Gurley isn't even with either Cowboys' defender ... but Goff is seeing it 10-12 yards further down the field.
A quarterback simply can't throw that route any better ... it terms of anticipation and accuracy. Especially considering the fact - if you believe this Myles Simmons - the play was only put into the gameplan a few days before it was implemented. Meaning ... they'd probably practiced it maybe 10-15 times total.
