Why is "all" before "kint" here, while in other sentences the verb is final? e.g. "A busz kint van"
Can I say "Egy magas rendor kint all"?
Yes, of course, it is totally correct.
"Egy magas rendőr áll kint." answers who stands outside? "Egy magas rendőr áll" answers where does the tall policeman stand?