So I did that whole walking thing just now.
And it is SO FUCKED UP that I had to stop just before I reached the Singapore Expo.
Here's what happened:
Right after I passed the flyover leading into Simei, I felt this burn right at the back of my heel, like rope-burn actually.
Stopped for a bit to check it out. Turns out there was this piece of hard plastic sticking out of the inside of my shoe that had chewed its way into my sock and was scraping the skin off the back of my heel.
I was literally being flayed alive by my very foot support system! So the pain was getting pretty unbearable towards the junction and I decided to take the bus back home.
Urrgh, I'm pissed. -_-"