It's a wonderful interpretation lads, but to send a keeper off for that is NOT in the laws of the game.
The pass to keeper rule, aka the backpass rule, is/was intended to keep the game moving faster and reduce time wasting. Any reference to stopping the ball going into the net was never made within the rule as a red card offence.
The law concerning stopping a goal scoring opportunity is in reference to cynical tackles when clean through with a ball at your feet.
You can't mix the two to suit your own ends.
Yeah this is right, there is nothing in the rules that states specifically that Mignolet should have been sent off.
However it is pretty vague and seemingly if Mignolet had handled the ball in the exact same way outside the area from a backpass when a striker was running onto it he would have been sent off for denying a golascoring opportunity. Yet denying a goal the way he did isn't a red card offense.
"A player is sent off, however, if he prevents a goal or an obvious goalscoring
opportunity by deliberately handling the ball. This punishment arises not from
the act of the player deliberately handling the ball but from the unacceptable
and unfair intervention that prevented a goal being scored"
Mignolet clearly did that but because he was inside the area :
"Outside his own penalty area, the goalkeeper has the same restrictions
on handling the ball as any other player. Inside his own penalty area, the
goalkeeper cannot be guilty of a handling offence incurring a direct free kick
or any misconduct related to handling the ball. He can, however, be guilty of
several handling offences that incur an indirect free kick"
Hence only a direct free kick for handling the ball from a backpass.
he doesnt know when to stop