为什么会有这样两种表达(来自新概念第三层文章） Armed with a torch.Looking at his

为什么会有这样两种表达(来自新概念第三层文章） Armed with a torch.Looking at his
Looking at his watch,he saw that it was one o'clock,but the bell struck thirteen times before it stopped.Armed with a torch,the vicar went up into the clock tower to see what was going on.
Looking at his watch 是vicar自己主动的动作,所以是用动名词,这我可以理解.
但我认为Armed with a torch也是vicar自己主动的动作,为什么要用ed形式呢?
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Our vicar is always raising money for one cause or another,but he has never managed to get enough money to have the church clock repaired.The big clock which used to strike the hours day and night was damaged many years ago and has been silent ever since.
One night,however,our vicar work up with a start:the clock was striking the hours!Looking at his watch,he saw that it was one o'clock,but the bell struck thirteen times before it stopped.Armed with a torch,the vicar went up into the clock tower to see what was going on.In the torchlight,he caught sight of a figure whom he immediately recognized as Bill Wilkins,our local grocer.
'Whatever are you doing up here Bill?' asked the vicar in surprise.
'I'm trying to repair the bell,' answered Bill.'I've been coming up here night after night for weeks now.You see,I was hoping to give you a surprise.'
'You certainly did give me a surprise!' said the vicar.'You've probably woken up everyone in the village as well.Still,I'm glad the bell is working again.'
That's the trouble,vicar,' answered Bill.'It's working all right,but I'm afraid that at one o'clock it will strike thirteen times and there's nothing I can do about it."
We'll get used to that,Bill,' said the vicar."Thirteen is not as good as one,but it's better than nothing.Now let's go downstairs and have a cup of tea.'

e armed with...用…武装起来
该词组表面是过去分词形式,但不表示被动,而是表状态,如同：
be satisfied with.../ be seated../ be interested in...等,英语中有很多类似的词组.