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Paul Walter Hauser is still running hot following his incident with QT Marshall at the AEW Revolution kick-off show on Sunday ... telling TMZ Sports the wrestling star crossed the line with his antics -- and he's gonna regret every bit of it.
We caught up with the Golden Globe-winning actor at The Grove in L.A. on Wednesday ... fresh off his appearance at AEW's big night at Crypto.com Arena.
The cameo resulted in Marshall throwing a drink on PWH ... and he explained why he took serious issue with the stunt.