So mines can hit their owners now in the next build, great seems like a good balance move for the short term life of a mine. I see a few issues in the long term though. First off, mining base and PGs will suck. If you drop a mine near an IP, PG, ect. like a good marine, you stand a fair chance that later in the match when you have forgotten who's mines are who's you could spawn/phase during a fight and be killed by a mine you placed ten minutes ago. This applies to anywhere you put mines really, but I see bases and PGs as the most likely problem areas. I expect that mines are going to be much less popular in general now, which I suppose is good. I just don't like that I'm gonna have to remember any mines I drop all game to avoid crappy accidents.
IMO, let mines hurt thier owners for either:
A) a period of time after the mine is deployed B) until the owner moves a certain distance away C) Until the owner respawns
All three or any combinations of them addresses (what I think) the main problem of marines dropping mines and standing on them during fights.
I think a better alternate solution is that mines hurt ALL marines, regardless of owner, AND, mines do not detonate if a marine is close to the mine. Universal rules for mines are much less confusing than, worrying about who's mine is who's...
Wouldn't mind seeing grenades hurt all marines either, but perhaps half damage of you didn't shoot the grenade. grenade covering friendlies is easy, can't understand why I don't see it more often.
Edit, the reason mines should hurt all marines if for situations where the aliens detonate the mine, IE bile bomb, infestation, ect.