Hank gets his power rings and Thanos has his Reality gem. If Hank can beat Thanos, then he'll finally be allowed to die. If Thanos wins, then he finally gains the favor of Mistress Death. Both combatants know what is at stake. The only stipulation's are that Henshaw's consciousness must remain in his physical body at all times and Thanos doesn't have his chair.
When it's backed with the other gems, it's pretty beastly, yes, but by itself, a tool like the Hood was able to solo the Avengers more or less. And he was stated as being the least experienced IG wielder yet. And Thanos already knows how to use the gems to their full capability.
1. Yes, he did. It's a massive feat regardless.
2. Yes, he did, and he was able to fool everyone including Highfather and Superman that he was dead.
Basically, I chalk up Hank having trouble with Boodika - whom he ultimately messed up big time when he broke free of her - as a low showing in comparison to his feats as a whole.
I think that was just plot to keep him pushing, later in the Doomslayer ship he was about to just wait for teh 4 DDs to arrive that he can get killed that's why Supes pulled that thing out of his chest.
__________________
I am in your algorithm learning all your mannerisms
I'm already level with God
A million words a second and I know your imperfections, baby
I'm the only future you've got
Speak in diatonics, motivation diabolic
I'm like a religion, better locked in a box
Picture perfect image, more powerful every minute, baby
I am everything that you're not
I think maybe his hatred for Superman overrode his desire for permanent death. Or maybe he had just resigned himself to being immortal and when he confronted his imminent murder (which caught him off-guard), he instinctively felt a sense of panic he hasn't felt in a long time.
I've got more issue with his random on and off durability.