In the case of the Tiger from Tiger Chess, the author didn't use the word "forward" but "outward" instead. In my opinion, with that word the definition is clear and not really ambiguous.
It is less obvious for me in the case of the Pegasus, leaping as a Knight then sliding outward as a Rook. The second leg can be understood with 2 manners. 1) f7 to g9 then sliding vertically to g12 2) f7 to g9 then sliding horizontally to l9.
In the case of the Tiger from Tiger Chess, the author didn't use the word "forward" but "outward" instead. In my opinion, with that word the definition is clear and not really ambiguous.
It is less obvious for me in the case of the Pegasus, leaping as a Knight then sliding outward as a Rook. The second leg can be understood with 2 manners. 1) f7 to g9 then sliding vertically to g12 2) f7 to g9 then sliding horizontally to l9.