"…!" Stark's pupils became so small that it almost looked like they disappeared once he noticed the possible weakness of the guardian ape.
~SLAM~
And at the same time, the guardian was still swinging its giant hand down, so close to Stark's that he wouldn't be able to avoid it under normal circumstances.
"TIME VISION," time slowed down around Stark as he needed these few seconds to think of a way to put his plan into action.
[Tip: find another way to end it for good, there is one.]
He hadn't found it as he kept avoiding the attacks, so instead of focusing on the environment he decided to focus on the ape, and he almost immediately noticed it.
An immortal being was something that shouldn't be able to be killed, at least that is what the definition says.
But… was the ape really immortal? Or was it only that its HP became infinite?
He couldn't take damage, thus nothing could harm it, that was true.