Enemy spawns and patterns?

[Ennie]

Sorry if this has been asked before.

How do the enemies spawn in PSU? Do they drop down or just "poof" appear like in PSO?

Are there "invisible barriers" like the doors in PSO, where if you went back the enemies would return into their positions?

How do the common enemies attack you? Do they slash at you continuosly like dumb Boomas or do they strike you and brace like the more intelligent Delsabers?

Just asking, I'm gonna check the videos and screenshots now. =3

[EspioKaos]

From what I've seen in videos, some enemies, such as the Vahra, run onto the field, while others, like the Panon, appear in a little purple puff. I'll have to watch the videos again to see how others spawn.