Yeah, looks like one of various assassin bugs. They have a spike they drive in and inject a digestive enzyme. It'll kill another bug just fine, but there won't be enough to be more than an irritant to a human unless there's an allergic reaction. Watch the area for irritation and infection.
If harassment continues, many species can deliver a painful stab with the proboscis, injecting venom or digestive juices. The effects can be intensely painful and the injection from some species may be medically significant.