Zapping the Berserkers
'Time to show them that the numbnuts can still be crushed even when they are made of metals.'
Eren had consciously selected Dino's left side. The copper berserker had kept his weapon to his right. So his left side was less guarded and he'd face difficulty to launch an attack with that arrangement in response to the butcher's approach.
For the first time since the fight started, Renita became useful to Eren. She kept Dino busy while maintaining a safe distance from him. She knew a berserker's charged attack wasn't something to be scoffed at. The gunslinger made full use of her long-range expertise to keep the metal mean machine at bay.
This was all Eren needed at the time. He approached Dino who had already detected him because of the former coming into his mana sense's range. But that didn't matter. Because Eren was too fast for Dino to respond on time at this close range.