(Can't think of a single scroll/wand/stave that telelocks. Which leaves one quest race with that potential option= bogus)
Blademastes aren't Qclasses.
(Only if you're a mino, otherwise two rounds of lag is not gonna finish the Moderately safe Cleric. And everyone agrees mino charge is overpowered. So what you're saying is the way to beat this particular OP tactic is to use another OP tactic?)"
The point is to save the charge for when he is down. Try to fight in a 1 room exit, so he misses his flee and you know where he is fleeing. Then you charge. Better used in conjunction with ... paralizys.
(That doesn't keep them from using portal, only delays it a little. Any moderately safe Cleric will be long gone before Paralysis can help you get a win. = bogus)
See above.
--(Can't comment here. Not sure of any that are thus telelocked that you can't portal (recall yes, portal no) out of.)
This is the knowledge part that aids in PK. Yes, noteleport rooms also block Portal.
--(yep. We'll just throw that out as totally bogus because either (1) this is an Elder/Leader cabal skill, hence you didn't mention it or (2) it doesn't actually exist, otherwise, why not make it a credible argument? = bogus)
Do I really have to spell out the cabal abilities?
Trusted, Tribunal, Council
Trusted ?, Nexus, Reaver.
--(Didn't I mention we're talking about a MILDLY CONSERVATIVE/SAFE Cleric? This will NEVER happen. = BOGUS)
This makes it sounds like he is more skilled than you. 
(only three classes can "shut down" a Cleric's offense. One additional can hamper it = bogus)
Any meele class can shut down a cleric offense. It's calling having the appropriate saves and melee weapon knowledge.
--(Taking a risk is one thing. Baiting them also is something else. What you're implying is trying to get the Cleric to be over confident and push a down-to-the-wire fight about who can get the last hit in...did I forget to mention Cleric's are an attrition class? For even a mildly skilled PKer this WILL NOT WORK. Not to mention, I'M TALKING ABOUT MILD TO MODERATELY CONSERVATIVE Clerics. That means at the slightest provocation, they portal. Unless EVERYTHING is going 100% their way. THIS is what makes them nigh unkillable, while still allowing you to get caught with your pants down, miscalculate etc. meaning that across a series of fights, the cleric will have MUCH better odds at getting the kill than the opponent will.)
They aren't unkillable. Your class might have more difficulty than others. That's just that. Some classes have easy time vs clerics.
Just to remind you what you can do to block Portal escape:
Skill that prevent portal:
Tribunal, Trusted, Council -> Ensnare.
Syndicate, Trusted ?, -> Abduction to no port out area.
Skills that prevent communing:
Nexus, Trusted?, Reaver -> Right chaos weapon
Berserker, Anger, Headbut SKullcracker
Blademaster, Race mastery, Critical strike.
Shaman, Blasphemy
Cleric, Path of deception, Blasphemy
Other stuff you can do:
Watcher, Webthing + Trip.
Mino triger charging.
Warrior Lore stuff, + Paralizys weapons.
Assassinate
Being a thief
Fighting in no teleport areas.
Baiting.
And other stuff I can't remember now.
So, what class are you using?
On offensive use.... It's mostly the prevention of recall. Which a Cleric will most likely do at the start of the fight with curse in order to land ray stuff. A veteran player will never recall when facing a Cleric. Most times nothing will happen, but if you show that you aren't afraid of recalling vs a Cleric, he will then place the Portal at your pit.
To who ever rolled the Cleric, you will regret choosing your race when thulgan logs in 