Matthews, a special teamer, was not on the field during the play in question and instead came on to congratulate his teammate:
Lynch took exception to the NFL's decision and fired back via Twitter:
I feel embarrassed to work for a particular organization that fined a teammate of mine for shaking my hand after a touchdown— Shawn Lynch (@MoneyLynch) January 23, 2015
For his part, Lynch received a $20,000 fine from the league for a similar gesture immediately after scoring.
But considering that Matthews was only promoted from the Seahawks' practice squad on Dec. 6, the dollar amount is substantial given his salary. The second-year NFL player who spent a two-year stint in the CFL is performing under a two-year, $940,000 contract with a $420,000 base salary this season.