Tiptronic question

[2 GTOs]

I test drove an 04 Boxster S today. First Porsche I have ever been in.

I noticed that if I mashed the pedal to the floor it dropped maybe 2 gears. When I lifted my foot of the pedal, it seemed to stay in the lower gear for a while. So if I were in 4th, the trans would drop to 2nd, I could take my foot off the pedal for maybe 2 seconds or so, the RPMs stayed high, then I could stop on the gas again, and I was still in second gear. It was like the trans was holding second gear for me, while I took my foot off the pedal and reapplied it.

Is this normal? Every other auto I had (not performance cars) would upshift within like a second of taking my foot off the gas.