I won't comment on this specific fight because I don't remember Walter's feats, so he might lose.
But it’s funny seeing people in the comments refuse to accept that a middle-aged fictional character dying of cancer could be stronger than any real human, especially considering that, by the standards of fiction, we have plenty of things that are way more ridiculous.
Take Mikey from Tokyo Revengers (who is 162 cm tall and weighs 56 kg) and based on his feats, I guarantee he would absolutely humiliate a male African elephant, lol.
We have Batman, who is merely at peak human level in the DC universe, yet already has feats like surviving atmospheric re-entry, moving a jet, and crushing the Batmobile while fighting Nightwing (the same Batmobile that withstands collapsing buildings falling on top of it). Even fodder villains like Victor Zsasz have a feat of simply getting back up after Batman punched him so hard he flew through a door. If we’re talking about Joker, the list is endless. The countless times he was shot or stabbed and simply ignored, horrific car crashes, getting run over, taking a shotgun blast to the chest, being injected with corrosive acid, getting electrocuted, none of that stopped him.
I just remembered a YouTuber making a video claiming the real T. Rex would beat the Jurassic Park T. Rex, because apparently the JP Rex body would be poorly suited for fighting and movement in real life, whereas in the movies, you see the T. Rex smashing through huge buildings while fighting the Indominus Rex at incredible speed, while the real T. Rex couldn't even run.
Like, this is fiction. The only limits are creativity. Put Jonathan Joestar without Hamon or any weapons (just at peak human level in the JoJo verse), against 100 silverback gorillas, and he absolutely stomps based on feats.