Read it through once

ALONSO. Whe’er thou be’st he or no, Or some enchanted trifle to abuse me, As late I have been, I not know: thy pulse Beats, as of flesh and blood; and, since I saw thee, Th’ affliction of my mind amends, with which, I fear, a madness held me: this must crave, An if this be at all, a most strange story. Thy dukedom I resign, and do entreat Thou pardon me my wrongs. But how should Prospero Be living and be here?