Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
Their instructions for bridging (see http://www.xareltohcp.com/dvt-pe/dosing-and-administration.html) just say to stop Xarelto 24 hours before the procedure and restart 24 hours after.
That backs up what I thought ... that the half-life of Xarelto is such that injections wouldn't be necessary.