AYOR.
As simple as that.
Its not about the bus if you think it is!
Potential implication includes the fact that there may be some
form of cover-up that you might not know of, or even remotely
considered. Especially if that SL friend of yours is telling you
the truth. Such things do happen in fact in various corporations,
and as outsiders, we should not delve
into this.
Maybe its better if he in fact "big hole" you after
all.
I refuse to elaborate further, but you should consider this
thoroughly.
I hope.
You don't even know who said it, plus almost every single SMRT
ppl knows it. 
Don't forget, you doesn't even have enough evidence(or even non)
to prove to them. Try hard bah~~ And in-case you aren't aware
also(perhaps you're like a frog in the well), this is nothing
sensitive~
