Meh, not saying that Krefeld played nicely, I haven't seen any of the games lately, but the slash doesn't look that much out of the ordinary. It's a slash, and that alone already makes it a penalty, but getting injured from a slash often has little to do with the viciousness of the slash and more to do with bad luck. A tiny tap can lead to a bad injury while a viscious slash can lead to absolutely nothing. This particular slash doesn't look like it was more than a common play players do all the time, trying to slash the stick, illegal, but not an attempt to injure. The injury does make it 5 + game though.
I don't think the last hit was against the head either, looks more like it hits the outstretched right arm which gets pushed back against the body and partially hits the player's own head. A concussion would probably come from the head hitting the ice afterwards. He definately didn't see him coming though and wasn't in a good position to be hit, which could be used to hand out a penalty for the hit.
DEL-teams definately aren't looking good so far. Doesn't help that some of them starting training quite a bit later than teams from other leagues, and there are some injury troubles as well, but the overall performance is very bleak. It's not surprising that they can't keep up on average with teams from better leagues, but right now they do look lost at times. They had shown much better performances in the last few years, even if it wasn't called the CHL back then.