Maintenance for the week of September 22:
• NA megaservers for maintenance – September 22, 4:00AM EDT (8:00 UTC) - 10:00AM EDT (14:00 UTC)
• EU megaservers for maintenance – September 22, 8:00 UTC (4:00AM EDT) - 14:00 UTC (10:00AM EDT)
Yes, they do injure the player.
And yes you also get AP for injuring them, if they die afterwards for example from another player, depending on how much you did you get more AP. Just injuring one that doesn't get killed in a specific time window won't provide any AP aside the usual deftick of a keep.