how to apply negation in OWL property chaining

I'm learning Semantic web and creating a simple ontology as shown below part of the learning process. Goal is to see if the reasoner can infer suggestedSkill (dotted line below)

Here, relatedTo is

• transitive
• symmetric

Here are a couple of instances

because of the transitive & symmetric characteristics, the way the reasoner infers is below

I've circled the problem above, how to model this correctly?

Appreciate any pointers.