Listen to my mercs mode woes: I first started playing mercs only after I beat all the campaigns, and so I went solo to test drive each of the maps, using youtube guides as a reference, and I memorized the location of all the time and combo bonuses. I decided it was time to get into it, so I went on a join duo game, and teamed up with some random player. We were kicking some serious butt, with a pretty high score, when suddenly with like a minute left, connection was lost to that player and the game just quit.
I was so angry. I decided to try it solo to circumvent these issues, playing chris on steel beast. I got an 'A' and unlocked Piers and Chris costume 2. Well I thought that if I could do that well solo, I'd really do well duo, my partner wouldn't even need to do that much.
So I tried duo again, this time hosting my own game. I scrolled through the objective options, and decided that to get someone who would at least be competent, and i would not have to baby sit, I would choose "high score hunks," as opposed to "just for fun." So I went as my newly unlocked Piers, with an Ada, on urban chaos. I knew the locations of all the time bonuses, so I got them first. My partner got maybe 1 of them too. I fought it out and waited till about 4 minutes left, when I started activating the combo times 1 by 1. Ada and I had not even seen each other twice during this whole time, so I assumed she had her own stuff under control. I was up on top of one of the busses, center of the level, sniping some unfortunate zoms and getting ready to activate the last combo, when suddenly the screen flashes white, signaling that apparently Ada is on the ground. All I had time to do was jump off the bus before she died. I was in total disbelief. All that time was wasted for nothing. I was like "you had ONE job Ada, ONE JOB. All you had to do was follow the damn train!"