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This is the Cyclops that cut the school in half by accident. At 1:05
https://youtu.be/HpnVssB1BRw

Yeah, probably

Probably.

Will it do more or less damage than black mantas?

I would go with less, but are we going with one blast or a sustained stream of eye beam?

One blast

I think there's a good chance that Aquaman will sustain some form of injury, based on how he was affected by Black Manta's rays plus grenade launcher, but it won't be any serious injury and he'll definitely survive a single blast.

He hot downed by a grenade, a blast from Cyclops probably KOS him