For those unaware, a “tradition’” started at Tech a very long time ago (20 years+) of throwing tortillas at the opening kickoff, because some moron at another Big XII school made some reference to Texas Tech and tortillas in the same context (we DO have a lot of really good Mexican food restaurants). You want tortillas? We’ll give ya tortillas. They are very dangerous, you know. Why, a flying tortilla can wreak absolute havoc on a…a…a… Hmmm. Can’t think of a thing. 
The truth is, an AD at one particular school wanted to attempt to intimidate Tech and other Big XII schools by pushing this issue. I believe the Big XII now has a rule that restricts such actions, because of this. No problem on the first two or 3 kickoffs, but eventually, I believe the ‘command center’ ordered the flag. You can see the R having a conversation with the command center before the announcement of the penalty. Yeah, a knife being thrown is far more serious than a tortilla. But, had no one made a big deal of the tortillas, this would not be a problem. The tortillas get picked up immediately, and the field is fully ready for play on the next down.