Sekera did his job alongside boards, Kukumberg collected puck and passed it to Stajnoch who overlooked (?) it and failed to collect the slow pass. This is how I´ve seen it.
Check your eyesight. Most everyone agrees it was a horrible pass by Kukumberg, from the corner right to the front of one's own goal (!), a textbook mistake. Also, the pass was anything but slow, was in fact much too strong. As I see it, Štajnoch was innocent in the situation. Miro Šatan criticized Slovan's "passing the puck to our opponent for the 3rd goal", he was just being nice to not mention any name. Štajnoch never made a pass in that situation -- he just did not manage to handle the bad pass from the corner, but I think it would be unfair to criticize him for it.
PS: For anyone wanting to assess the situation, it starts at 6:07 of the above highlights video.
From the replay, I agree the pass was a bit stronger than needed, but I agree with kajoo that the main mistake did the guy who wasn't able to handle that puck coming to him. He's playing on the level where he should clearly be able to do that.
I disagree... The pass should never have been made in that direction at all. I watched the situation live in the arena and all spectators around us were like, "OMG, what was that pass about?!" It seemed a lot more obvious from watching it live than on TV how inappropriate that pass was.
Also, Ovi's goal was a lot less impressive live than on TV. The main TV viewing angle makes it seem as if Ovi's shot had to overcome some obstacles while travelling to the net when in fact it didn't. Ovi had an empty net in front of him. It was just bad short-handed play by Slovan, when all of Slovan's players focused on Anisimov on the right side, and failed to react when Anisimov quickly passed the puck to Ovi, left completely alone on the other side.