Sentence:  She saw a young couple go past, embarrassed and blushing under showers of rice and riotously convoyed by what clearly was an East Side bridal party. This she saw with a quick darting pang — not a pang of envy exactly, nor yet of jealousy; just a sharp, <WSD>stabby</WSD>, little sort of pang, that's all. 
Meaning of the word marked with <WSD> tags:  coming on suddenly and acutely felt