With that kind of skill, this shot was less a gamble and more just a very firm reminder to Jason about who's in charge in Gotham. His life was never in any real danger.

Source: Under the Red Hood

Source: Superman Adventures 2014, Issue 41

Source:
Lex Luthor: Man of Steel #5

Thus, he held firm to his ideals and did what a true hero would; put himself in harms way to spare others pain.

Source: Deadpool Kills the Marvel Universe (2011) #1

Source: All-Out Avengers Issue #5

They knew that killing the Teen Titans would lead to murderous retribution from the Justice League instead of the usual, measured response they could exploit.

So they just stood around "charging" their powers until the effect wore off.

Therefore, even lowballing it, Batman should be able to move and perceive at a moderately FTL pace.

Thus; he saw the wave of the EMP coming and simply decided to tank the ensuing crash in order to lure the Joker in.

Source: Legends of the Dark Knight #142-145

May it win many more awards in the future.