This is a well known method to defeat the Giant Bat Boss in RE0 with the Grenade Launcher's Napalm Grenades. You will most likely only have 6 Napalm Grenades at this point if you've been saving ammo during your Hard difficulty playthrough. I had 6 Napalm grenades, 6 Acid grenades and 6 normal grenades. Obviously, I only want to use 5 Napalm Grenades. Save inside the church. Make sure you have Napalm grenades inside the Grenade Launcher. Go through door, skip cutscene, go to alter, aim up, wait 4 bat to get close to attack you, fire at it. You'll stun lock him, now keep switching targets to re-lock onto him and shoot it 4 more times. If done correctly, you'll kill it in 5 Napalm grenade rounds.
Resident Evil 0
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