After the discrepancy between the announcement and Nazta's datamine, I had the chance to try it out and see for myself, so I decided to write it here so to clear any doubts around it.

The skill's in-game description is "5x physical attack combo on one enemy" just like in the announcement, and I used it after manually selecting one opponent. She went and attacked random enemies with each attack, just like any other barrage-like ability. This severely reduces her usability in multi-target battles.

Looks like Gumi's tradition of messing the skill descriptions up hasn't changed at all. I wonder if it's a mistake like Ling's passive giving MP instead of crit (in which case it might be fixed later), but chances of that happening are probably slim.