Hello Dodge and Babochka.
Go back and read what the Op has revealed about his particular situation. He was busy confessing and the Priest knocked on the wall and sent him away without absolving him. The Priest’s intent was to get him to leave, not give Penance or Absolution. That is clear. The penitent is also revealing that his intention was to confess all his recalled sins. He got cut off and sent away without absolution. This is a no brainer. He wasn’t given a Penance, asked to make an Act of Contrition, nor given Absolution. If he confessed mortal sins, he’d have to repeat them over in another confession. That cannot change because someone wishes to seem charitable and err on the side of leniency. If his sins were only venial, he is in the clear. However, he did state that he refrained from the Eucharist and that is the correct thing to do and said it all. Since it isn’t necessary to say anything further because I cannot ask him to reveal anything he may have confessed to or if his sins were mortal. That is out of line and truly uncharitable. No one has that ability. It is very rude.
The quotations cited regarding intent only apply in grave necessity such as the amphibious boats about to land on D-Day and the Priest delivering General Absolution over all the sailors and soldiers as they prepare for mortal combat or in a crowd of hundreds who have no other means of confessing for a length of time in the future. And in those situations the intent applies to the penitents, not the Priest. They must intend to go to Confession under the usual means as soon as it becomes available or the General Absolution won’t stick. Nice try though. It doesn’t apply to the OP’s problem. There was no mumbled barely audible Absolution delivered by the Priest. He knocked on the wall loudly and that signaled his actual intent Babochka, the intent was to stop the penitent from confessing further and to end their encounter.
Then there is the simply matter of peace. Jesus was want to wish peace to folks when He was with us. It is a great blessing to be at peace and the peace of Christ that He died to give comes to us through the Sacrament of Confession. Jesus died to give us that peace with Him. He shed His Precious Blood for our Redemption. Those who monkey around in the confessional are seriously wrong to do so for God sent His only begotten Son to accomplish the Redemption of mankind and He died to give that Absolution to the OP. It is a direct affront to God’s work of Redemption to treat this particular Sacrament in anything less than an honorable manner and does grave harm no only in the immediate sense to the penitent, but in the larger sense to us all. Priests who monkey around with this most august of Sacraments are risking their own Redemption. God died to give the penitent His peace. That should say everything to the Ordained man.