Everything with Bill Ackman’s Pershing Square Tontine Holdings (NYSE:PSTH) SPAC (special purpose acquisition company) is complicated. When it comes to SPAC stocks, PTSH is just a little different than the rest. Source: Dmitry Demidovich/ShutterStock.com First, Ackman set up the deal with a different structure ($20 par value vs. $10 for other SPACs) compared to others. Then,…