Your requestor thread can process only one action at a time. If you have to run two activities , one of them has to be operated in asynchronus modeon a separate thread ( aka Parallel thread ) . So in that case, to trace the second activity you have to do a remote tracing. 

Call-Async-Activity Is one such method that can be used here. It will execute a given activity asynchronously. It is possible for the caller activity to wait till the spin off activity is completed. This can be done by providing a pool id and then waiting on that pool id using Connect-Wait method in subsequent steps.