Actually there are 3 different heys in the dance Grimstock,one with no mention of hands one (the one in the 2nd figure) of which may be a simple dip and dive. Or is it a dip & dive holding both hands with partner? And is the hey in the 3rd figure a cross-Grimstock, or is it the figure that Cecil Sharpe describes in his interpretation, or something else completely.
Not so easy to guess what the concise dance directions in Playford mean. Actually all dance instructions are open to misinterpretation; in books from the first half of the last century (and in some modern cd insets) the term "R hands across" is used for something that most people would call a right hand star - and I've known some callers invent a different figure on reading this.