It's pretty much a channel since she has to keep distance within the enemy she places it on. So why can't my Q interrupt it when I play as Kassadin? Very few champions have channel spells.. Seems kinda wasted on just Malazhar ult or Vel'koz ult.
EDIT: It appears it's a tether. So why doesn't Rito make his Q interrupt tethers as well so he has more outplay with his Q.
MinaZer03 votesbecause it isn't channeled?
Ex. of channeled would be 
Q
Möral Support1 votes[{quoted}](name=ILittle IMonster,realm=NA,application-id=3ErqAdtq,discussion-id=AsBT6d6E,comment-id=0001,timestamp=2017-02-16T02:03:10.139+0000)
because it isn't channeled?
Ex. of channeled would be
Kassadin doesn't cancel any abilities... it's not a silence anymore (it has been like 2 years since he was like that).
EndlessSorcerer1 votesIt still interrupts channeled abilities.
SaltyKracka2 votesIt's a tether, not a channel.
Unreformed Shaco1 votesYeah, why do you think no one plays him anymore?
It used to be a blanket 2 second silence, but they nerfed him cause it was bullshit.
Ark Sorcerer3 votesThey nerfed him because of his high ban rate. He had tons of factors a to why he was powerful.
EndlessSorcerer1 votesIt isn't a channel.
It is a tether.
Iron Wu1 votesThan perhaps they should expand his Q to interrupt tethers as well, therefore make his Q less specific.