White Crane lineage have chi sau drills as well as Praying mantis and some eagle claw lineages.
Basically chi sau is bridge that teaches you in a non-threathen way how to utilize the techniques before gradutating to sparring.
It develops sensitivity in techniques so that you can feel with your hands oppose to seeing with your eyes...Most close range styles will have some form of chi sau to develop your tools you grasp from the forms and drills.
The Flow is relentless like a raging ocean with crashing waves devasting anything in its path.
"Kick Like Thunder, Strike Like Lighting, Fist Hard as Stones."
"Wing Chun flows around overwhelming force and finds openings with its constant flow of forward energy."
"Always Attack, Be Aggressive always Attack first, Be Relentless. Continue with out ceasing. Flow Like Water, Move like the wind, Attack Like Fire. Consume and overwhelm your Adversary until he is No More"