Did I ever tell you guys ‘bout the time I was at the hairdressers and my Mam gave me a bottle of coke and I thought ’Oh is that some coke?' but or some reason my tongue went 'no we’re gonna say this’ and in the middle of the hairdressers I said “Is that chocolate?” to a coke bottle
I sat for three hours trying to work out that connection.
Theory on Moriarty: (this ain’t nothing technical but eh, fuck it)
Packets of fake blood. Or real blood. Depending upon how he obtained it - could be simply goat or sheep’s blood from the butchers, easily to obtain and not really seen as dangerous - could even be found in meat or from farms. Not the point though, a small, concealed package, shrunk with chemicals or something, one click of a button - triggered by the trigger on the gun going off - which is likely a false, a blank fire, likely modified to recreate the real fire without the bullet or killing blow. Possibly a shot of hydrogen or some other chemical to release the chemical reaction that would trigger the blood from the ‘bullet’. It’s easy to play dead when your enemy has a play to perform. While everyone’s busy with Sherlock and John it’d be simply to slip away, perhaps leave a body disguised as Moriarty or simply hire someone to remove the 'body’ - possibly someone within the force, someone trusted? - while the world mourns Sherlock nobody will be focused on Moriarty, so it’d be easy to play dead.