And as you can see, Hank's control over said robots is fine tuned enough that he can actually meld them into [enormous] basic constructs, and use them offensively.
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Hank's immortality extrapolated on...
"And this is why Cyborg Superman can never die -- Because he is, in truth, already a ghost... A consciousness of pure energy that can jump from machine to machine":
Henshaw is:
a). Taking control of the Watchtower, shaping it in his image;
b). Harnessing more power than the Blue Light and Starlight combined;
c). Far more powerful than even an Alpha Lantern, Boddika;
d). It's revealed that in GLC Boddika didn't kill him as she had thought - Cyborg Superman was just hiding inside her metal shell, awaiting rebirth.
e). Capable of regenerating his whole body within moments; (hey there, Lobo)
The fight with this version of Doomsday ends when Henshaw uses his speed and strength hitting Doomsday so hard, he rips half of his body apart. A truly insane feat.
But Doomsday evolves into Cyborg Doomsday. Henshaw can now no longer regenerate and his control of the Watchtower is lost. What does he do? He goes on and physically fights Doomsday some more.
Supergirl intervenes and stops the fight. But Henshaw wants none of that so what does he do, even in his very weakened state? He instantly manifests a weapon capable of killing Supergirl.
I agree, Henshaws performance was beastly here. Other than Imperiex, nothing has ever come even close to the damage Henshaw inflicted on Doomsday here... and to top it...and upgraded Doomsday who needed to upgrade AGAIN (and Henshaw to lose his powers) to win.
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Humans are afraid of the dark.
And yet… At the same time, we’re fascinated and bewitched by it.
Maybe that’s why humans drink the darkness that is coffee.