SANTA CLARA Why did the 49ers have so much trouble with the St. Louis Rams last season? The Rams knew the 49ers' tell, according to safety Craig Dahl.
Dahl said Wednesday he told his new coaches the Rams were able to pick up on cues from the 49ers' offense that told them whether the 49ers were planning to run or pass. That's a huge advantage for any defense, especially against a team like the 49ers that uses a strong running game to set up its passing attack.
"It was a few different things," said Dahl, who spent the last four years in St. Louis. "Some personnel and alignment stuff really were the big keys as far as the giveaways."
That information was well-received by the 49ers, but it didn't sit well with one of Dahl's former teammates, Rams cornerback Cortland Finnegan, who called Dahl "lame and weak" on Twitter.
Wrote Finnegan, who has a reputation for pugnacious play: "Craig Dahl we know how you play thanks for the tips we know who to attack early and often."
Dahl said he met with the 49ers' offensive coaches when he joined the team in March and that those giveaways already have been eliminated.
"It's been addressed and corrected," he said. "They knew most of it before I even got here, and they were just reconfirming it. It's just ongoing self-study and self-scouting stuff that got that cleared up."
The Rams and 49ers tied in their first game last year, and the Rams came from behind to win the second one in St. Louis. Both games went to overtime. The 49ers averaged 24.8 points last season but just 18.5 in the two games against St. Louis.
The 49ers recently hired Eric Mangini to offer another set of eyes for the offense. Mangini's defensive background presumably would help the 49ers detect the type of tipoffs that gave the Rams an advantage.
Daniels catches, too There was an interesting dynamic to the 49ers' practice Wednesday.
Scott Tolzien and B.J. Daniels presumably are competing for the same spot, the No. 3 quarterback. Daniels, however, spent a lot of time lined up as a tailback and often was Tolzien's check-down target during seven-on-seven drills. Daniels caught at least four passes out of the backfield on the second day of the team's minicamp.
Daniels also had one of the more exciting plays at quarterback. Practicing the goal-line offense, he found no one open and started sprinting to his right. At the last moment, he fired a pass to the near corner of the end zone to receiver Ricardo Lockette, who was able to dig the ball off the grass for a touchdown.
Et cetera The team released tight end Cameron Morrah and signed receiver Brandon Carswell, who injured his knee early in practice. Carswell remained on the field and the injury does not appear to be serious.
Rookie running back Marcus Lattimore, coming back from a gruesome October knee injury, sprinted for the second straight day as head trainer Jeff Ferguson and general manager Trent Baalke observed.
Construction on the 49ers' new stadium is expected to resume today. It had been halted the last two days after a worker was found dead Tuesday morning.