After a 23-year wait to qualify for a major tournament, Scotland's hopes of making more history by getting out of the group for the first time now look slim.
The hosts were desperately missing the driving runs and poise on the ball normally provided by Kieran Tierney on the left side of a back three.
Robertson burst onto Ryan Christie's pass but his shot that was headed for the top corner was tipped over by the Sevilla goalkeeper.
However, the home side were stunned by a moment of brilliance from Schick on 52 minutes as he spotted Marshall off his line from halfway and bent in an incredible shot from just inside the Scotland half.
Beating old rivals England would more than make amends for the Tartan Army's disappointment, but Scotland now have a mountain to climb if they are to prevent their long-awaited adventure ending in familiar fashion.