In Injustice 2 #3, Batman is outmatched by another Batman (which carries two Submachine guns). In the latest edition (#34), this Batman is seen talking with Ra's al Ghul and Solovar.
Who is this evil Batman?
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In Injustice 2 #46 it is revealed that this is a certain Jason. The familiar dialogue he has with Damian makes me think that this is indeed Jason Todd. Since he was revived with the Lazarus Pit, this would explain his connection with Ra's. Interesting enough however, he has now a bit white hair like Jason Blood who was killed by Spectre in Injustice Year 3.
In Issue #46 of Injustice 2 the fake Batman is revealed to be Jason Todd aka Red Hood.