I'd agree with VJunkie's assumption, i.e with the area being
muddy and all, it's highly possible that the controlled forms were
in a physically bad condition after the fall. I think that could be
the main reason why he looked less-than-pleased with you. Add dirty
unused forms to dirty used ones which need following up on, and
what you get is a person who gets possibly irate.
I wouldn't be too quick to jump the gun though. You have to
understand though that what you offer the forumites here is your
perspective, and to be fair, perspectives are always
subjective.
For example, to you, he could be staring at you and attempting to
intimidate you. But it could also be possible that he was just
looking at you the normal way he looks at people. He might, or he
might not. My point is, you wouldn't know him well enough to tell.
He might be a moody fart, or maybe he just looks like he's got a
permanent scowl.
Likewise your choice of words. 'sorry ah not purposely what, i was
walking you can see there's no space and why must i bang you?' and
'Look i already told you i'm sorry, what more you want, you think i
wanna bang you for fun is it?' could be your way of explaining
yourself, and likewise he could have seen it as your being rude or
smth like that, depending on the tone you use. No one else here
knows what actually transpired except the four of you and maybe one
objective eyewitness, i.e. the lady in the car.
If you asked me, I'd say that all this is just a misunderstanding,
brought about by assumptions. For all you know, he might not think
too much of the entire incident, or he might even have forgotten
the incident altogether. Don't take it to heart lah. You're only
spending unnecessary energy doing so.
Cheers. 
PS: VJunkie when you passing out? Haha.
