Texas Holdem All-In Question
Because Player 1 made the final raise, he should be the first to show his cards when players reach the showdown. However, according to the World Series Of Poker rules,


  When a player holds a hand that is likely the winner, they should show that hand immediately to speed play.


In this case, it appears Player 2, in an effort to speed up play, short-cutted the word "call" and went straight into the showdown. Showing your hand in response to a shove (an all-in raise) is definitely considered a call by poker pros.