pulse goes down?

[jesusfreak666er]

hey so swim has been tweakin on addy for a few hour now here a quick log

6:12 PM 8/2/2006 30mg snort
7:40 PM 8/2/2006 ~10mg snort
8:58 PM 8/2/2006 15mg snort
10:05 PM 8/2/2006 30mg snort
10:36 PM 8/2/2006 15mg snort

anyway here is the question or statement. Swim took his pulse after the 30mg snort, and it was 127 standing, 95 sitting. Swim wasnt shocked but a lil high. So swim has a pulse-ometer (measures pulse, oxygen saturation... doctor in the family very good to have) and well swim noted that his pulse is now at 10:37ish low, 92 standing. What could explain the initial shock and pulse raise then lower later even though more is in my system? Did swims body cope, or what?