thanks for the report, sounds like good entertainment!
About Waske, he doesn't mind pissing off some opponents and doing his own thing. If there is a tension on the court or a looming psychological battle, Waske won't refuse it or back down like a chicken. Maybe there was something which really irritated him and which you couldn't make out, maybe there not and it was just show.
If he took too much time (if it really was 30 seconds or above), then bad job of the umpire. And I hope the ballkids detected this manner of Waske that he often always wants the same ball to serve again if he won the point. This can speed it up also.
And if Pless said what you wrote, it's a very bad and unsporting reaction, too. If Waske didn't insult Pless, I would rate such words even worse than taking a bit more time between the points than you are allowed to.