Understanding this, if someone wants to invest their emergency fund with risk, then I said that they should invest some part of it instead of investing the whole amount.
However, I think it is better to keep the emergency fund in fiat.
This is terribly wrong, your emergency funds is not meant for investing, even though you are investing only a cent of it, no, don't do that.
This is why reverse funds is set aside, so that a dip buying opportunity can be utilized proper, but thinking to invest part of your emergency funds is a terrible financial mistake that you might pay dearly for if any serious real life emergency situation arise during that period of time you invest some part of it.
Your emergency funds should only be tempered with when a serious real life emergency situation that threatens your Bitcoin holdings ariss, nothing else.
I'm not disputing on the fact that our emergency funds should be used for our bitcoin investment, as it is not advised for an investor to be investing from his emergency but from his discretionary income. Just as sir JayJuanGee said in his previous post here.

I totally agree with this, a guy can do whatever he feel like doing with his emergency fund since the emergency fund may be higher than the discretionary fund, that is because emergency issue don't come up so easily, so with this a guy may be having enough emergency fund than that of discretionary fund that has alot of loads to carry.