A press pack outside a crown court in the rain isn’t the sort of place you want to be setting up off camera flashes, but taking advantage of other photographer’s on camera flash can be equally as effective (for ‘equally as effective’ read ‘pretty bloody lucky’).
It’s a nice surprise to flick through your card and have one picture that jumps out, although I wouldn’t recommend shooting at slow shutters and praying that you catch a flash as good professional practice…