A Cross trade can be a great signal during the day for entry point. A mal MM has been in the box all day (say BMAK), then all of a sudden you see a 4mil print 3 ticks below current price, but the share price doesn't change. This can be the mal MM signaling they are done and about to move back up and allow a window in the L2 for trading. This is often termed 'MM mark out"

Thank you SW - I told ya I am slow. Still juggling work and trading..my best excuse, anyhow. Or maybe it's just dementia? LoL