Teachers should not do anything to cause their students to lose respect for them.
Evidence
Teachers should not ~SLR do anything to cause their students to lose respect for them. And students can sense when someone is trying to hide his or her ignorance.
Conclusion
A teacher who does ~KA → ~PTK not know the answer to a question a student has asked should not pretend to know the answer.
Evaluate
The argument PTK + ~KA → SLR assumes that students lose respect for teachers if they try to hide their ignorance.