SEA VS CIN Week 1

SEA Defense is being credited with 5 sacks on the game with only 4 players accounting for sacks.

The play in question that SEA has been given a stat: 3rd QRT 13min 26seconds Andy Dalton Fumbled a ball and SEA caught it in the air and returned it for several yards.

Could you guys review the play and let me know your thoughts on it? Why would SEA be given a sack or the reason behind it?

Thanks!