‘playing with fire’ and ‘getting away with murder’

1. What does the green highlighted sentence mean? It contains two idioms ‘playing with fire’ and ‘getting away with murder’ in one place.

2. What are the two ‘realities’ in the orange highlighted sentence? The fact that dark play is 1)"subversive" and 2) "its agendas always hidden"?

Context:

This possibility of audience involvement takes us towards the anthropological concept of ‘dark play’ in public spaces, which McGonigal invokes as part of her analysis as something that may occur on occasion. Corresponding to a form of ‘invisible theatre’ dark play is ‘play based on deception and subversion, in which some players may not be aware they are playing’ and would apply here to instances in which secondary participants do not realise they are actually party to or taking part in a ‘fictional’ or contrived situation: in other words, they are ‘playing in the dark’. Naturally, there are ethical implications to this, but, as Richard Schechner seems to imply, dark play’s tendency towards ‘playing with fire’ and ‘getting away with murder’ are also precisely the risk factors that potentially reap insightful rewards. For him ‘dark play is truly subversive, its agendas always hidden’. The two ‘realities’ that can be said to be in operation at once in dark play, and that ensure this covert aspect, offer all manner of possibility to ‘subvert orders, dissolve frames and break its own rules – so much so that the playing itself is in danger of being destroyed, as in spying, double-agentry, con games and stings’