Notice the highlight film; it's not of his arm, it's of his legs.
The Rams are a fast D and can handle a QB who can run and scramble. We handle the best one in the league, Wilson, every year. And Tolzein is no Wilson.
If this guy was so fearful to play against he'd be a starter somewhere.
Just like with the Niners, when a team takes a guy who is always some team's back up and installs him as their starter, they have major QB issues. The Colts have QB issues when Luck is out (just as most teams have issues when the 2nd string QB has to play a few games).
Tolzein will not be the issue. The issue will be if the Rams O can move the ball against the Indy D (which isn't exactly a Great Wall of China). This is the same issue that the Rams have faced for a decade; it all comes down to the Offense because generally speaking the D can be counted on to carry its own load.
As the Rams offense goes, so will this game go.