What I find disappointing is the reaction from some able bodied men on the train and their lack of courage in their failure to take down this degenerate with extreme prejudice
but in the real world there are not supermen that can stop a speeding bullet before it hurts anyone. usually stabbings happen so quick people dont have time to react,
from what i can see of the edited videos flying around the internet. is after the attack even Iryna Zarutska cant beleive what just happened and not even realise how bad her injuries are. so for other train passengers at off-set angles thus unable to see it all, may not have known it was a "brutal stabbing" initially, and instead thought it may have just been a bad punch fight between a couple.
many times we see it. how getting involved in other peoples business back-fires on the 'have a go hero' so most people keep themselves to themselves to avoid the risk of harm to themselves but would rightfully help out once they spot injuries
although many did try to help her once she collapsed and realised what had happened after the coward had left the immeadiate scene of the crime.
the one guy in grey sweater got up when the attack happened and followed the stabber, obviously putting out the call to the cops giving description and direction of escape, as the stabber was stopped by cops before he even got out of the station. and yes when others realised the extent of the injuries quickly swooped in..