Should have been a safety?

[ATLpanther]

I may be an idiot but how was Ransom’s pick not a safety?  
He got the pick and then fell down after a couple yards like college rules but was never close to being touched. Then dropped the ball which was a fumble, then picked it up and ran down the field into his own endzone. How was that not a live ball? Not complaining just seemed very odd to me because he was never touched. Help me understand. 
 

https://www.panthers.com/video/lathan-ransom-ends-the-bucs-chances-with-late-game-interception-week-16-2025-highlight

[uncfan888]

He gave himself up when he went down

[tukafan21]

After he fell down and got back up to run, that next time going down was him clearly giving himself up, which draws an immediate whistle, no different than a QB sliding in that situation.

[AggieLean]

Gave himself up. Plus, didn’t they call the play dead 

[Jon Snow]

Just now, uncfan888 said:

He gave himself up when he went down

This^ Game over.

[ATLpanther]

2 minutes ago, Jon Snow said:

This^ Game over.

Roger that. Thanks guys. Mods please delete thread. 

[Pantherxtreme]

Many have already said it, he gave himself up and refs blew the whistle.